As a previous Aztec owner, I can say with some certainty that
A. There was an issue with main doors opening in flight, which was corrected on the earlier versions with an AD requiring a second latch to be incorporated (looks like a car door lock button).
B. There has never been any link proven between Aztec doors opening and any in-flight handling issues - while there have been crashes connected with open doors (on Aztecs and many other types) the subsequent crashes have been as a result of loosing control due to distraction from the primary task of flying the aeroplane (or in a couple of cases from objects coming out of nose lockers and clouting props), not from any 'blanking of control surfaces' etc.
Not all old Aztecs are buckets - this was my panel then (dunno what its like now) - check out the Garmin 340, 300XL and 327, the JPI, the fully coupled 3-axis AP (incl GS) and the generally good nick. On the outside were two new engines, fresh paint, and everything as mickey-schmick as could be achieved.
