What was found
MAIN DOOR: MAIN DOOR OPENED NORMALLY BUT ON 3RD ENTRY THE DOOR DROPPED SEVERAL INCHES. SOMETHING GAVE WAY AND THE DOOR WILL NOT TAKE WEIGHT WITHOUT MAKING CONTACT WITH THE FUSELAGE. THE DOOR WILL NOT CLOSE PROPERLY. MAIN DOOR BEARINGS AND INTERNAL LOCKING POINTS CLEANED AND LUBRICATED IAW AMM 12-22-00. DOOR OPS CHECKED MULTIPLE TIMES AFTER LUBRICATION AND CLEANING WITHOUT FAULT. OPS CHECK GOOD AT THIS TIME.