As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - AFTER EXTENDING GEAR AMBER DOOR LIGHT REMAINED ILLUMINATED. TOWER CONFIRMED RIGHT MAIN GEAR DOOR HANGING. LANDED ORD WITHOUT INCIDENT. AIRCRAFT TAKEN OUT OF SERVICE FOR EVALUATION. REPLACED RIGHT HAND MAIN LANDING GEAR SAFETY VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.