As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6767 - IAD-PWM - DURING APPROACH, AIRCRAFT MADE AN UNSCHEDULED LANDING AND DIVERTED TO BOS DUE TO FLAP FAULT WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED BPSU, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)