As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/EWR - FLT 6479 - DURING CLIMB AT 1430 HOURS ON 4-22-97, MADE AN UNSCHEDULED LANDING AT IAD DUE TO FLAP ASYMMETRY CAPTION ILLUMINATED. AIRCRAFT WENT TO GATE AT IAD WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND CLEANED CORROSION ON RT FLAP TRANSDUCER, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)