As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, AFTER THE FLAPS WERE RETRACTED, THE FLIGHT CREW NOTED THE LE FLAPS TRANSIT ANNUNCIATOR REMAINED ILLUMINATED. CREW ACCOMPLISHED THE QRH PROCEDURES AND ELECTED TO RETURN TO DEPARTURE. THE ACFT LANDED WITHOUT ANY FURTHER INCIDENT. MX R & R THE NR3 L/E FLAP RETRACT PROXIMITY SENSOR IAW AMM 27-88-11 WITH THE OPS CHECK SATISFACTORY. THE ACFT RETURNED TO SERVICE.