As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATE EXTENSION DOOR WAS NOT FULLY CLOSED SO MAIN GEAR DID NOT RETRACT. CREW REPORTED A TRASH BAG STUCK IN THE ALTERNAT EXTENTION DOOR AND DOOR WAS NOT FULLY CLOSED. IN THIS CONFIGURATION WITH DOOR OPEN THE GEAR WILL NOT RETRACT. ONCE BAG WAS REMOVED BY CREW AND DOOR WAS CLOSED GEAR OPERATED NORMALLY WITH NO DEFECTS NOTED.