I went out to fix an outdoor merchandiser, today. Customer has had to reset the GFCI several times. Finally, he ran an extension cord from an indoor socket.
I pulled the cover, checked a few things. The compressor runs, there is good frost back to the compressor. So, I did the ohm meter and check what might be leaking to ground. Then, made some repairs.
The fellow came back and asked what I'd done. Check, test, isolate, do some taping up, replace a few parts.
He says "I thought it might have needed a shot of freon". I assured him freon is not electrically conductive, and has nothing to do with tripping an electrical socket. Clueless.