As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR INSIDE HANDLE EXTREMELY DIFFICULT TO OPERATE, OPENING AND CLOSING. FROM THE INSIDE WITH DOOR CLOSED.//CORRECTIVE ACTION// INSPECTED AND OPS CHECKED MAIN CABIN DOOR. OPEN AND CLOSED MAIN CABIN DOOR 8 TIMES AND DOOR HANDLE OPERATED A SHOULD PER CESSNA 560XL MM CH 52-10-00. OPS CHECK GOOD AT THIS TIME NO DEFECTS NOTED.