As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6429 - IAD-JFK - DURING TAKEOFF, RETURNED TO THE GATE AFTER EXPERIENCING A FLAP FAULT CAPTION ILLUMINATION ON THE CAPTION PANEL. AIRCRAFT ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE TROUBLESHOT THE DISCREPANCY AND FOUND THAT THE LEFT FLAP POSITION TRANSDUCER HAD FAILED. MAINTENANCE REPLACED THE LEFT FLAP POSITION TRANSDUCER AND RELEASED THE AIRCRAFT FOR SERVICE. (M)