What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT CREW REPORTED THAT THE FLIGHT DECK DOOR JAMMED CLOSED AND REQUIRED EXTREME FORCE TO LOWER CORNER LATCH SIDE OF DOOR TO OPEN AT CRUISE. INTERFERENCE JAMMING OF DOOR OBSERVED. LATCHES WERE NO FACTOR WITH JAMMING. MAINTENANCE FOUND ALL SCREWS IN THE VERTICAL DOOR JAMB BACKED OUT AND LOOSE CAUSING CLEARANCE ISSUE. MAINTENANCE SECURED THE LOOSE SCREWS ON THE DOOR JAMB AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO ISSUES NOTED.