What was found
MAIN CABIN DOOR REQUIRES EXCESSIVE FORCE TO OPEN AND CLOSE DOOR HANDLE FROM INSIDE THE CABIN. UPON ARRIVAL AT AIRCRAFT, CONFIRMED CABIN DOOR IS SLIGHTLY HARDER TO OPEN THAN USUAL. WE NOTED SAND AND DEBRIS ON THE LOCKING PINS. WE REMOVED THE DOOR TRIM AND INSPECTED INSIDE WITH NO DEFECTS FOUND. LUBRICATED BELLCRANKS AND LOCKING PINS IAW CE560XL AMM CH 52-10-01 AND RE-INSTALLED TRIM. HANDLE AND DOOR OPERATION IS NOW MUCH SMOOTHER. OPS CHECK GOOD AND NO OTHER DEFECTS NOTED.