As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE GROUND HANDLING, THE CREW REPORTED THAT THE MAIN DOOR MECHANISM HAD BECOME INCREASINGLY DIFFICULT TO OPEN. MAINTENANCE INSPECTED THE DOOR AND LUBED THE DOOR HANDLE MECHANISM AND THE DOOR SEAL. FOLLOW ON OPERATIONAL CHECK OF THE DOOR WAS GOOD.