What was found
WHEN READY TO DEPART, WE ATTEMPTED TO CLOSE THE MAIN CABIN DOOR. DOOR COMES UP NORMALLY, BUT THE HANDLE IS STUCK AND WILL NOT COME DOWN TO LATCH THE DOOR CLOSED. ATTEMPTED TO CLOSE THE DOOR FROM THE OUTSIDE AND THE OUTSIDE LATCH WILL NOT CLOSE EITHER. CALLED OUT TO MEET CREW OUT ON RAMP. WHEN I ARRIVED AT A/C THE CREW EXPLAINED THEY WERE HAVING DIFFICULTIES CLOSING THE MAIN ENTRANCE DOOR. ATTEMPTED TO CLOSE THE MED BUT COULD NOT DUE TO HANDLE BEING STUCK & WOULD NOT STOW TO LOCK POSTIION. ATTEMPTED TO CLOSE MED FROM INSIDE & SAME RESULTS INSIDE HANDLE WILL NOT SLIDE INTO THE STOWED & LOCKED POSITION. TOWED A/C INTO HANGAR & BEGAN PREPPING FOR MAIN DOOR AIRSTAIR REMOVAL TO PERFORM GENERAL VISAULAL INSP OF MED INNER & OUTER DOOD HANDLE LOCKING MECHANISIM. CW: REMOVAL OF MED AIRSTAIR AS REQ'D. PERFORMED GENERAL VISUAL INSP OF ALL AREAS UNDER AIRSTAIRS INCLUDING ALL HARDWARE, MECHANICAL LINKAGES, PROX SWITCH SENSOR CONNECTORS & INNER/OUTER DOOR HANDLE LOCKING MECH WITH NO DEFECTS NOTED. ATTEMPTED TO STOW INNER DOOR HANDLE & NOTICED UPPER MOST FWD DOOR PIN RUBBING ON INNER DOOR TRIM PIECE. ADJUSTED TRIM PIECE, CLEANED OUT ALL PINS AND LUBRRICATED. CLOSED UP ACCESS PANEL TO MED LOCKING MECHANISIMS & INSTALLED AIR STAIRS AS REQ'D. REF: MM 52-10-05. OPS CHKD GOOD.