My wife also has a PAM512 and its good to know if this is a common problem with the PAM512 or a rare thing to happen.
Did your AD watch technician give you any feedback on what he found and what he did to rectify the issue?
I look forward to your reply!
Dutchman, Panerista since 2014 and learning
PAM389 and PAM372 and a bunch of straps