The other thing to consider with the OVP is poor solder connections internally. There isn't any realistic way to get inside the OVP without breaking something, so when issues arise with the OVP, you're time and money ahead to substitute a known-good unit, or install a brand new one.

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]