A search in !!!!!!!!!!!!!! with the combination "Airbus" and "MNG" results in just A300B4 findings, so I assume this is the only type MNG operates.
In a
Swiss Spotter Forum one pax reports about a flight AYT-ZRH in a MNG A300B4 a few days before the incident. He describes the same yaw oscilations as referred to in the report during the flight, sometimes violent ones. He was seated at the emergency exit (a type 1 exit right behind the wing) and reported air leaks at the door. Might have been the same plane. Violent yaw oscilation may result in slight fuselage deformation and hence some relative movement between the door and the door frame, which cold lead to wear on the locking mechanism.
But this is pure speculation.
If the Airline rates this ´event´ not as an incident, probably no investigation nor a report will reveal details.