What was found
MAIN DOOR: UNABLE TO LOCK THE MAIN CABIN DOOR FROM THE INSIDE. WE WERE ABLE TO LOCK THE DOOR ONCE BUT HAD A VENT DOOR AND LOCKING HANDLE LIGHT INLLIMINATED ON THE 6 PAC. WE WERE UNABLE TO LOCK THE DOOR ON THE SECOND ATTEMPT. THE HANDLE WOULD NOT MOVE PAST THE 1 OCLOCK POSITION WHEN TRYING TO ROTATE IT TO THE LOCKED POSITION. // SIGNOFF// COMPLIED WITH OPERATION OF MAIN CABIN DOOR. OPERATIONAL CHECKS GOOD. COULD NOT DUPLICATE FAULT. VERIFIED CORRECT OPERATION OF DOOR LOCK LIGHTS. REMOVED MCD STAIRS, INSPECTED HANDLE OPERATION AND PROPER MOVEMENT OF DOOR COMPONENTS. NO DEFECTS NOTED. ALL WORK DONE IAW CESSNA 560XL MM 52-10-00 PERFORMED CABIN DOOR LUBRICATION IAW CESSNA 560XL MM