As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DOOR: MAIN CABIN DOOR HANDLE COMES OUT BUT CANNOT TURN TO OPEN. ARIVED AT THE AIRCRAFT AND ATTEMPTED OPENING THE MAIN CABIN DOOR. THE EXTERNAL HANDLE WOULD POP OUT BUT WOULD NOT TURN. CLEANED AND LUBRICATED THE DOOR HANDLE AND ROD MECHANISM. PERFORMED SEVERAL CYCLES OF OPENING AND DOSING THE DOOR WITH NO FURTHER ISSUES. REFERENCE AMM 12-20-04.