How to Troubleshoot & Replace Ge AP4360545 / WR08X10096 Refrigerator Compressor Overload Protector

Most advice on Internet said the clicking noise could be from a broken PTC relay, which struggled to start the compressor. Replacing the PTC relay, the OLP (overload protector), maybe even the capacitor, could fix the problem. I took out the relay and the OLP, tested them. They were OK. Upon further inspection, the suspect seemed to be the ice maker. The ice maker was taken out (after removing freezer baskets that were in the way). The clicking sound disappeared (been 24 hours now). (Side bar: Error codes "88"showed up after plugging in the electricity, which is nowhere to be found in the Owner's Manual. One place said it's the circuit board or electricity problem. Tried reset, not working. … Finally pushed left-most and right-most buttons simultaneously for 10 seconds, error codes "88" disappeared.)