I investigated this issue cuz I thought my OVP may have been wacky. A search should reveal that some have opened theirs up and resolder connections. I could not figure out how to open mine without destroying the casing.

If you do not find such threads here, I may have been on the MBCA site when I found some info.

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W108M117(1972) repaired after deer hit
W124M103(1987)
W124M103(1989) -- sold to son's friend
W124M119(1993) --
W124M103(1987 -- 5 speed Euro) - sold to forum member
W124M103(1989) -- TE
W123OM616(1977)
W201M103(1990) parts car