As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 1137 - CLIMBING OUT OF PHL EN ROUTE DTW, CREW RECEIVED A GEAR DOOR WARNING LIGHT. FLIGHT DIVERTED TO PIT AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE FOUND THE PROXIMITY SENSOR ON THE LEFT GEAR DOOR LOOSE. SENSOR WAS ADJUSTED AND TIGHTENED. (M)