[CambridgeWorks]

I also wonder how many compressor engineers would just change the pcb, the entire module or condemn the whole compressor unit?
I doubt many would have the knowledge to understand how the pcb operated and had basic skills to spot the obvious voltage issue into the regulator.
I used to come across that before I retired. No manual, then no repair could even be attempted. Or worse, manual available but not had the full training course, so cannot attempt any repair!
Years of experience is a valuable asset.
Worth a pint or two. Good un!
Rob