Ice forming on flow thru vent in fridge not cold enough

Refrigerator & Freezer Repair
1

Brand:Whirlpool
Model Number:ED5FHAXV000
Freezer cold, ice on flow through vent, fridge not cold enough
What happens & when:

Error Code (if any):None
Parts or tests already tried: Teck did not repair correctly
Photos / video link:

2

What repairs were attempted by the tech? Was anything replaced?

3

Nothing replaced, just hair dryer ice melted

4

wondering if you had any suggestions, thermostat, heater/defroster??

5

You sure that’s the correct model number as no parts comes for that!