As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DOOR OPEN LIGHT STAYED ON AFTER LOWERING GEAR. WE RECYCLED GEAR AND LIGHT WENT OUT AFTER THE GEAR HAD BEEN DOWN FOR APPROXIMATELY 30 SECONDS. CLEANED AND LUBED MAIN LANDING GEAR DOOR UPLATCH HOOKS AND ROLLERS. OPERATIONAL CHECKED THE GEAR DOOR UNSAFE SWITCHES AND GEAR DOORS IAW DC-9 MM.