What was found
WHEN CLOSING MAIN ENTRY DOOR FROM INSIDE THERE IS A LOUD POP WHEN THE DOOR STARTS UP. WHEN DOOR IS CLOSED AND THE HANDLE IS PUSHED DOWN. THERE IS A GRINDING NOISE THAT GOES ON FOR A FEW SECONDS BEFORE DOOR SEAL IS PRESSURIZED CORRECTIVE ACTION: REMOVED MAIN ENTRANCE DOOR ACTUATOR (PN-GS321-0591-9, SN- H1170)AND REPLACED WITH CUSTOMER SUPPLIED REPAIRED ACTUATOR. PERFORMED SYSTEM RIGGING AND FUNCTIONAL CHECK, NO DEFECTS NOTED. SYSTEM OPERATIONAL CHECK GOOD. WORK PERFORMED IAW GL-5500 AMM 52-11-25. INSTALLED ACTUATOR WAS REPAIRED.