As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS-YHZ - FLT 4693 - CREW NOTED LEFT OVERTEMP LIGHT HAD ILLUMINATED. CREW FOLLOWED CHECKLIST AND SHUT OFF THELEFT BLEED. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT DUCT OVERTEMP SWITCH AND OPERATIONALLY CHECKED THE SYSTEM GOOD. (M)