I've just repaired an EX3 that had it's handle ripped off. So presumably it had quite an "accident".
However, after rebuilding it, the lens continually zooms out when in servo mode.
I've tried cleaning the lens contacts, and even disconnected the zoom controller on the handle, but that made no difference.
Strangely though, if I do a back focus adjustment then the lens zooms in and does it's adjustments with no errors.
I haven't got another lens or body to swap over with, but I'm just wondering whether anyone else has come across something similar.