have 12 year old kenmore (whirlpool) refrigerator (top freezer)
style, that is struggling to keep designed temperatures. since
a few days ago, the freezer temp will only get down to 26 degrees
F and the refrigerator temp is about 50 degrees F at best.

have done significant troubleshooting. no problem with evaporator
coils or defrost thermostat or defrost heater or refrigerator defrost
timer. condensor coils are clean, both fans operating properly.

temp of compressor tube outlet (to condenser coil) is 109 degrees
F and temp of compressor tube inlet is 84 degrees F. temp of
tube after capillary expansion just before it goes into evaporator
is barely below freezing. i think it should be much lower than
that.

i am trying to decide if i have a failing compressor or a plugged
freon line line somewhere. there is no evidence of any freon
leaks.

i can email pictures if anyone can help. thanks.