As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A/C HAD INFLIGHT TURNBACK LT MLG DOOR NOT CLOSING. MAINTENANCE FOUND LH MLG UPLOCK (FIN 321212) ROD ASSY (REF A310 IPC 32-36-44-02 ITEM 100) ADRIFT FROM RETAINER BRACKET (REF A310 IPC 32-16-16-05 ITEM 100). THE RETAINER BOLT WAS MISSING. INSPECTION SHOWED NO DEFECTS ON COMPONENTS. ONLY RETAINER BOLT MISSING. HARDWARE REPLACED. OPERATIONAL TEST CARRIED OUT SERVICEABLE.