What was found
MAIN CARGO DOOR "A" OPEN LIGHT ILLUMINATED INFLIGHT, PRESSURIZATION NORMAL INITIALLY, FLICKERED AT FL 200 THEN REMAINED ON STEADY IN DESCENT UNTIL SHORT FINAL THEN WENT OUT. ACN RELEASED FOR SERVICE PER MEL/CDL: 52-15-01 CATEGORY: C EXPIRATION: 14DEC07 "MEL 52-15-01: MAIN CARGO DOOR WARNING LIGHT SYSTEM (A ) INOP. VERIFY DOOR CLOSED AND LOCKED PRIOR TO EACH BLOCK OUT. "A" OPEN LIGHT C/0340477. T/S TO CABLE GOING TO AFT BLOCKER ASSY NEEDS ADJ.AND IS CAUSING SWITCH S9058 TO BE ON THE EDGE OF MAKE OR BREAK. ADJ AFT BLOCKER ASSY CABLE IAW NASI MM 52-30-00 PG 504.