What was found
MAIN DOOR HANDLE: MAIN CABIN DOOR WILL NOT CLOSE. HANDLE STUCK IN OPEN POSITION. HANDLE WILL NOT CLOSE FROM INSIDE OR OUTSIDE AIRCRAFT. ARRIVED AT AIRCRAFT, GAINED ACCESS TO MAIN CABIN DOOR LINKAGES, REMOVED DIRT FROM CABIN DOOR LINKAGE, PERFORMED OPS CHECK OF MAIN CABIN DOOR SEVERAL TIMES. RETURNED AIRCRAFT TO ORIGINAL CONFLG. WORKED IN REF TO CE680A AMM 52-10-50,