As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - CREW REPORTED STATUS MESSAGE RECIRC FAN DISPLAYED ON LOWER EICAS DURING DESCENT WITH ASSOCIATED SMELL OF SOMETHING BURNING THROUGHOUT CABIN. FLIGHT LANDED LHR WITHOUT INCIDENT. AFT UPPER RECIRC FAN DEFERRED INOPERATIVE PER MEL 21-03. CIRCUIT BREAKER PULLED AND COLLARED. REPLACED AFT UPPER RECIRCULATION FAN AT DFW ON 06/27/2011. SYSTEM GROUND CHECK NORMAL OPERATION.