GE Refrigerator cooling partially, pulling only 1.3A

[puterboy]

We have a ~28 year old GE TBX22PAYARAA Refrigerator.

A few weeks ago, it stopped being able to maintain normal refrigerator & freezer temperatures -- even at max settings

The unit runs all the time but the freezer doesn't get much below 20 degrees and the refrigerator is stuck at about 45 degrees.

Strangely, the unit draws constantly only about 1.3A constantly (except when the defrost cycle is on). This current draw is more than just the fans alone but less than the compressor should be drawing if operating normally.

Indeed, the compressor must at least be partially working since it is cooling a bit. If the compressor were overheating, overworking, or wearing out, I would expect the current draw to increase not decrease.

It's as if the compressor is not drawing enough power so it is not fully compressing the refrigerant resulting in less cooling. However, I have no idea what would be causing this.

NOTE:
- Evaporator coils are clean and frost-free
- Evaporator motor is working
- Condenser coils are clean
- Condenser fan motor is working
- Thermostat seems to be working
- Defrost cycle & heater are working
- Incoming power is fine (20A circuit, only appliance on the circuit, voltage is normal, no brownout)

Any idea what might be wrong?