As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- RED GEAR UNSAFE LIGHT CAME ON MOMENTARILY FOLLOWED IMMEDIATELY THEREAFTER BY BOTH AMBER MAIN GEAR DOOR LIGHTS DURING CRUISE FLIGHT. ADJUSTED THE LEFT HAND UPLOCK PSU SENSOR AND LEFT AND RIGHT HAND AFT DOOR SENSOR. INSPECTED GAP OF THE LEFT HAND UPLOCK PSU SENSOR AND FOUND TO BE WITHIN LIMITS. NO PARTS REPLACED.