30 day old fridge won’t hold temp

Refrigerator & Freezer Repair
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Brand:Whirlpool
Model Number:WRF535SWHB08
Main Symptom: fridge temp fluctuating
**What happens & when:**Hi, I am having trouble with a new whirlpool refrigerator model number WRF535SWHB08. After 30 days of operating nominally (fridge temp 38F. Bottom freezer temp 0F), the refrigerator temperature warmed up to 48F. The bottom freezer remains at 0F. Evap fan runs quietly, no visible ice buildup in freezer, damper in fridge is open , not blocked by food and I feel some cold air blowing in (I don’t know how much air flow is normal). The heat radiating fins under the fridge are clean and free of debris. The first thing I tried was pulling the fridge away from the wall. No change. Second attempt I unplugged the fridge for 12 hours and then plugging it back in. The fridge cooled back down to 38F for about four hours and then warmed back up to 50F. I used the thermestor wire on my Klein multimeter to test the fridge temp with doors closed. The multimeter read 38F while the fridge control panel read 51F. I tested the freezer for accuracy and both read 0F. After an hour the fridge temp and multimeter temp in the fridge both read 51F and there was no further cooling. I did observe the damper automatically close and evap fan stop, then heard occasional “drip sizzling” noises in the bottom freezer from the freezer coils area. (I assume that was a defrost cycle) the fans started up and damper re-opened but no change in fridge temp. After that I tried unplugging the fridge for a day with all doors open and plugging it back in. No water visible in bottom freezer or on floor. This time the fridge did not cool down at all. Fans and damper all still working but fridge control panel and multimeter both consistently reading 51F. I just turned on the max cooling button for a few minutes and then turned it off. Freezer now at -3 and fridge is starting to cool from 51F to 43F. I live at 12,000 feet in the mountains and no service tech will come up here. My findings and how the fridge is behaving don’t make sense to me so I’m looking for advice on how to proceed.

Error Code (if any):no error codes
Parts or tests already tried:
Photos / video link:

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Here is the tech sheet and parts list for now.maybe someone from AppliancePartsPro will jump in to help more.
Whirlpool WRF535SWHB08 Refrigerator Tech Sheet - W11623343 - Rev B.pdf (488.4 KB)
Repair Parts List - W11655119 - Rev A.pdf (2.3 MB)

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Symptoms of a Refrigerant Shortage:

• Rise in food temperatures in both the refrigerator and freezer compartments.
• Long or continuous compressor run times.
• Visible traces of oil indicating a refrigerant leak or cracked refrigerant line.
• Lower than normal wattage draw.
• Compressor may be hot to the touch due to extended run times.
• Condenser may be closer to room temperature than normal.
• Capillary tube may feel warmer than normal with a slight refrigerant shortage.
• A noticeable hissing sound may be heard in the evaporator due to an incomplete liquid column in the capillary tube.

Symptoms of a Restriction:

• Reduced cooling performance and warmer product temperatures.
• Lower than normal suction pressure, often in a vacuum.
• Frost or condensation at the point of restriction.
• Temperature difference across the restriction, with the evaporator side being cooler.
• Longer than normal time for system pressures to equalize after the compressor stops.
• Lower than normal wattage draw.
• Kinked lines, restricted drier filters, or restricted capillary tubes can cause these symptoms.

Symptoms of Air in the System:

• Continuous compressor operation.
• Higher than normal head pressure.
• Air and moisture entering through a low-side leak.
• Temperature readings that do not match the expected pressure-temperature relationship.
• Reduced cooling performance.

Recommended Actions:

• Inspect the system for refrigerant leaks and signs of oil residue.
• Check for restrictions in the drier filter, capillary tube, condenser, or refrigerant lines.
• Correct any leaks found.
• Replace the drier filter.
• Evacuate and recharge the system with the specified refrigerant charge.
• Do not attempt to purge air from the system, as this may result in an improper refrigerant charge