You didn't happen to add a little refrigerant before working on the electrical. Your pressure (25bar) seems high for 420 rpms. What is it key on engine off. There is a common occurance of pressure switch problems but I've also seen too much refrigerant cause your problem and there was no other problem.

Actually both instances a can or two of refrigerant was tried, before he brought it to me.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician