What was found
COMPLY WITH: 670BA-53-040 - CENTER FUSELAGE, PRIMARY STRUCTURE BS 280 TO 295, INSPECTION AND REINFORCEMENT OF LINTEL STRINGER 3 OF MAIN PASSENGER DOOR. REV C PART(S) B. SERVICE BULLETIN 670BA-53-040 REVISION C,- CENTER FUSELAGE, INCORPORATED COMPLIED WITH ALL STEPS OF REO 670-53-21-493 REV - D. COMPLIED WITH TASK CARD 51-900-1002-SKY.