As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - FLT 104 - DURING DESCENT, SMELL ODOR, BURNING RUBBER IN COCKPIT, NO WARNING INDICATIONS IN COCKPIT SMELL DISSIPATED ON FINAL APPROACH. RIGHT AND LEFT PACK OPS CHECK DURING APU AND ENGINE OPERATION NO UNUSUAL OR STRANGE SMELLS NOTED. SYSTEM GROUND CHECK NORMAL OPERATION. (M)