As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A, AFTER TAKEOFF RIGHT GEAR DOOR LIGHT STAYED ILLUMINATED. CHECKLIST WAS FOLLOWED WITHOUT FIXING THE PROBLEM. AIR TURNBACK TO ONT DUE TO THIS PROBLEM. CLEANED AND LUBED RT MAIN DOOR UPLATCH MECHANISMS. OPS CK NORMAL IAW MM 32-32-06.