As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 6303 - EN ROUTE BOS-PHL, RIGHT DUCT OVERTEMP LIGHT ILLUMINATED, CREW SHUT OFF BLEED VALVE AND LIGHT WENT OUT. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE RIGHT DUAL TEMP CONTROL VALVE AND SYSTEM OPS CHECK GOOD. (M)