As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR (REPEAT ITEM) CREW REPORTED ELECTRICAL SMELL IN FIRST CLASS CABIN. FLIGHT LANDED LHR WITHOUT INCIDENT. FOUND UPPER FORWARD RECIRCULATION FAN CIRCUIT BREAKER POPPED. PLACARD RECIRCULATION FAN INOPERATIVE PER MEL 21-3A/2-681C-C. REPLACED RECIRCULATION FAN AT DFW ON 02/29/2012. SYSTEM GROUND CHECK NORMAL OPERATION.