As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FL 1723 - GEAR WOULD NOT RETRACT AFTER TAKEOFF FROM PHL. CREW WENT THROUGH CHECKLIST/RECYCLED GEAR. FLIGHT RETURNED TO FIELD TO PHL. NO EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE LANDING GEAR LIGHTS CIRCUIT BREAKER POPPED. RESET BREAKER. SYSTEM CHECKS GOOD. ALL INDICATIONS CHECK NORMAL. (M)