As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: 3R DOOR INSIDE DOOR HANDLE EXTREMELY DIFFICULT TO OPEN AND CLOSE. MAINTENANCE FOUND R3 DOOR TO BE VERY STIFF AND LUBRICATED DOOR LOCKING MECHANISM / BEARINGS PER AMM 12-22-52. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.