What was found
LGA - FLT 1865 - IMMEDIATELY INTO TAKEOFF ROLL, AFT CARGO DOOR LIGHT ILLUMINATED IT WENT OUT, THEN FLICKERED WHILE TAXIING. TRANSFERRED TO DIM, AFT CARGO DOOR INDICATION INOP. DOOR FOUND CLOSED AND LOCKED, CREW STATED AIRCRAFT WAS ROLLING AT 40 KNOTS NORMAL BRAKING APPLIED. FOUND HARDWARE LOOSE ON STRIKER TIGHTENED AND ADJUSTED IAW MM CH 52-31-00. (M)