As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION, LEFT GEAR UNSAFE LIGHT WAS INTERMITTENTLY ON. RECYCLED GEAR, LIGHT REMAINED ON INTERMITTENTLY. OPERATED WITH RIGHT HYDRAULIC PUMP IN HIGH AND RESTRICTED AIRSPEED TO 300 KNOTS. REPLACED THE PROXIMITY CONTROL BOX AND THE MAIN GEAR UPLOCK SWITCH IAW DC-9 AMM 32. OPS CHECKED PROXIMITY SWITCH CONTROL BOX IAW DC-9 AMM 32-60-01-2. PERFORMED GEAR SWING CHECK. OPS CHECKED GOOD IAW DC-9 MM.