As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT, GEAR DOOR OPEN LIGHT ILLUMINATED WITH RIGHT HYDRAULIC PUMP IN HIGH MODE. LIGHT WENT OUT FOR 10 MINUTES THEN ILLUMINATED WITH PUMPS IN HIGH. RECYCLED GEAR AND PERFORMED UPLATCH CHECK SATISFACTORILY. ADJUSTED LEFT MAIN LANDING GEAR DOOR POSITION SENSOR IAW DC9 SMM 32-60-03.