As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - FLT 86 - EN ROUTE ORD-LHR - A BURNING SMELL WAS NOTICED THROUGHOUT THE AIRCRAFT. SHUTDOWN NR ONE PACK AND SMELL SEEMED TO DISSIPATE. DIRTY PACK SMELL NOTED ON DESCENT INTO LHR. LANDED LHR WITHOUT INCIDENT. INSPECTED NR 1 PACK AND CHECKED ALL RUBBER GAITORED COMPONENTS. NO DEFECTS OR BURNING SMELLS NOTED. REPLACED COALESCER BAG. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)