As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DOOR: MAIN DOOR HAS BEEN GETTING PROGRESSIVELY MORE DIFFICULT TO OPEN. IT IS STILL FUNCTIONAL BUT NEEDS EVALUATION FOR LUBRICATION AND/OR POSSIBLE ADJUSTMENT. // SIGNOFF// PERFORMED SERVICING AND LUBRICATION OF THE MAIN CABIN ENTRY DOOR IN ACCORDANCE WITH CESSNA 680A AMM 12-20-40. PERFORMED SEVERAL SATISFACTORY OPERATIONAL CHECKS OF THE MAIN CABIN DOOR. NO FURTHER DEFECTS NOTED.