As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6577 - IAD-JFK - DURING CLIMB-OUT, RETURNED TO IAD DUE TO THE FLAP ASYMMETRY LIGHT ILLUMINATING DURING CLIMB-OUT. AIRCRAFT RETURNED TO IAD WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED THE RT FLAP POSITION TRANSDUCER. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)