As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 8959 - AFTER TAKEOFF AND GEAR RETRACTION FROM MCO, EN ROUTE TO PHL, THE LEFT MAIN LANDING GEAR RED UNSAFE LIGHT ILLUMINATED STEADY, THEN INTERMITTENTLY AND THEN EXTINGUISHED. CREW RECYCLED GEAR AND GEAR INDICATION WAS NORMAL. FLIGHT CONTINUED ONTO PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE LEFT MAIN LANDING GEAR UPLOCK SENSOR DEFECTIVE. REMOVED AND REPLACED SENSOR. OPS CHECK OF INDICATION SYSTEM NORMAL. (M)