As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 1479 - EN ROUTE PHL-DFW - AFTER TAKEOFF, LEFT ENGINE REVERSER UNLOCK LIGHT ILLUMINATED AND REMAINED ON. RETURNED AND LANDED PHL WITHOUT INCIDENT. REPLACED BOTH UPPER AND LOWER LATCH SWITCHES. PERFORMED OPERATION CHECK. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)