As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DOOR OPEN INDICATIONS ON MFD. VISUAL INSPECTION OF THE DOOR SHOWED TOP RT FLAG NOT FULLY SEATED IN PLACE. WHILE TECH WAS CHECKING THE MEASUREMENT OF THE GAP BETWEEN THE UPPER LOCK AND THE BELLCRANK PER THE AMM .TECH FOUND THE UPPER MED DOOR LOCK SWITCH TAB TO BE OUT OF ADJUSTMENT. TECHS ADJUSTMED LOCKING SWITCH TAB.