As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT THE LANDING GEAR "NOT LOCKED" LIGHT WAS ILLUMINATED WITH GEAR EXTENDED. MAINTENANCE PERFORMED THE FOLLOWING IN ORDER TO RETURN THE AIRCRAFT TO SERVICE. PERFORMED DETAILED INSPECTION OF LANDING GEAR. LUBRICATED LANDING GEAR SYSTEM. ADJUSTED LEFT AND RIGHT MAIN LANDING GEAR UP LOCK HOOKS.