As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - FLT 108 - EN ROUTE BOS-LHR - THE FORWARD EQUIPMENT EXHAUST FAN CIRCUIT BREAKER (20H) POPPED. CREW NOTED ELECTRICAL BURNING, NO SMOKE. AFTER 10 MINUTES SMELL WENT AWAY. LANDED LHR WITHOUT FURTHER INCIDENT. REPLACED FORWARD EQUIPMENT EXHAUST FAN. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)