What was found
WITH OUR BEACON ON, A MECHANIC OPENED L FWD ENT DOOR FROM OUTSIDE THE AIRCRAFT WHEN THE SLIDE WAS ARMED. THE SLIDE FELL OUT OF THE DOOR WITHOUT INFLATING. OLD SLIDE FOUND IN MAIN CARGO IN NET. REMOVED DOOR LINERS FROM DOOR, VERIFIED CORRECT OPS OF DOOR DISARM CABLE, ALL CHECKS GOOD WITH EXTERIOR HANDLE DISARMING DOOR. FOUND ONE OF THE BARLOCKS FOR THE GIRT BAR WITH A MISSING SCREW FOR THE TARGET. INSTALLED NEW SCREW IN TARGET ON BARLOCK. REINSTALLED DOOR LININGS. INSTALLED NEW SLIDE ON L1 DOOR, REMOVED SAFETY PIN FROM SLIDE INFLATION CYLINDED & STOWED IN POUCH. L1 DOOR ASSIST BOTTLE REMAINS TO BE R/R'D.