As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR UNSAFE LIGHT ILLUMINATED IN CRUISE. NOT LATCHED LIGHT ON FLIGHT ENGINEER'S PANEL ILLUMINATED WITH SELECTION RT GEAR POSITION. PERFORMED ABNORMAL. LIGHTS EXTINGUISHED WHEN LANDING GEAR WAS CYCLED. MAINTENANCE FOUND RT MAIN LANDING GEAR DOOR NOT LATCHED PROXIMITY SWITCH SENSOR DIRTY. CLEANED PROX SWITCH SENSOR OF DIRT AND DEBRIS. PERFORMED OPERATIONAL CHECK OF MAIN LANDING GEAR DOOR PROX SWITCHES MM 32-60-00-2. ALL SYSTEMS CHECKED GOOD.