I have a problem with my rear passenger door on my 1992 500E Euro. Regardless of the lock stem location (up/down) the rear passenger door refuses to open from either the inside or the outside handel. Any suggestions on how to access the locking mechanism and what to look for.
I do notice that the pneumatic actuator(s) are a bit slow (it's - 5 C here) but all the other doors lock and unlock without issue.
Thanks in advance!