As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - CREW REPORTED ODOR OF HOT PLASTIC IN FLIGHT DECK. NO SMOKE NOTED AND ODOR GRADUALLY ABATED. FLIGHT LANDED LHR WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND FORWARD EQUIPMENT COOLING FAN STATUS MESSAGE POPPING CIRCUIT BREAKER. DEFERRED FAN PER MEL. REPLACED FAN AT DFW ON 11/15/2012. SYSTEM GROUND CHECK NORMAL OPERATION.