As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6227 - IAD-JFK - DURING TAXI, MADE AN UNSCHEDULED LANDING AT IAD DUE TO AC MAIN AND RT INVERTED CAPTION LIGHT ILLUMINATED. AIRCRAFT WENT TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED RT INVERTER, OPS CHECK OK. AIRCRAFT WAS APPROVED AND RELEASED FOR RETURN TO SERVICE. (M)