As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6351 - IAD-SWF - DURING CLIMB, MADE UNSCHEDULED LANDING DUE TO RIGHT BETA LIGHT ILLUMINATED DURING TAKEOFF. AIRCRAFT LANDED AT IAD AND RETURNED TO GATE, NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED BETA SWITCH, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)