As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CREW DECLARED AN EMERGENCY INTO BOS ON ACCOUNT OF LEADING EDGE FLAP INDICATION. FLIGHT LANDED WITHOUT INCIDENT AND TAXIED TO THE GATE. MAINTENANCE ACCOMPLISHED FSEU BITE, FOUND FAULTED TRAILING EDGE FLAP SENSOR. REMOVED AND REPLACED TRANSMITTER IAW AMM 27-58-91. OPS CHECK GOOD.