As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RED GEAR UNSAFE LIGHT CAME ON AT CRUISE AND THE RIGHT GEAR DOOR LANDING GEAR AND LIGHT WENT OUT. PERFORMED LANDING GEAR DOOR SWITCH TEST AND ADJ/TEST MAIN GEAR DOOR. CLOSED PROXIMITY SWITCH. BOTH CHECKED GOOD. ADJUSTED DOOR UPLATCH TURNBUCKLES IAW DC-8 MM 32-30-00-2. CLEANED AND LUBED SWITCHES. SYSTEM CHECKED GOOD ON THE GROUND.