Anybody familiar and would like to explain in brief the following ad sb for a 1979 414 with 9,900 hours that I’m considering to buy   Looks like nothing that relates to this has ever been done on it by logbook examination.

Thanks

AD 2005-12-13
Service Bulletin MEB00-7 (lower wing spar and skin inspection)

my autopilot is inop.  It will only work if I leave the button pressed down with my finger.  Any ideas on what could be wrong with it?  Thanks !