Service manual for Maytag refrigerator MTB1895AEB?

Brand: Maytag
Model Number: MTB1895AEB
Main Symptom: defrost cycle runs way too long
What happens & when: Regularly

Error Code (if any): none
Parts or tests already tried:
Photos / video link:

I am trying to troubleshoot a defrost cycle that runs way too long. It doesn’t run long enough to defrost the meat in the freezer, but it’s enough to melt the ice cream, frozen dinners, etc. The fridge also goes from being way too cold to not cold enough. Does anyone have a service manual for this model? Thanks.

Here’s the service manual and the tech sheet for that one.

servicemanual-16025860.pdf (1.7 MB)

techsheet-16023494.pdf (171.6 KB)

Perfect. Much appreciated. Thank you!