re: Troubleshooting a fridge

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Now I have nothing but a little bit of frost on the first line.

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cheapest test fix....

Go to your appliance store, ask for a RCO410 three in one start kit. ($10) replace your entire compressor relay/start system with this unit. hell sometimes in testing we direct power it over night. It is very possible that you have a bad relay from the unit overheating due to the failing fan.

the relay is an engineered weak point and is designed to fail before the compressor does in overheat situations. It may cool and work sporadically but may cause further issues.
If you put the 3n1 on it (or pay the $50 for the proper replacement but Whirlpools are fine with the universal) (unless you have a three phase compressor - grey box with three harness to it, one going to compressor) you will be able to accurately see how the system runs with a known good relay and a strong capacitor.