What was found
ON DESCENT, PASSING FL180, STARTED GETTING A STRONG BURNING SMELL. DONNED O2 MASKS AND RAN QRC AND QRH. DECLARED AN EMERGENCY, UNEVENTFUL LANDING. CRASH, FIRE AND RESCUE INSPECTED EXTERIOR FOR EVIDENCE OF A FIRE, NONE NOTED. CFR, ALSO INSPECTED INTERIOR OF AIRCRAFT, NO NOXIOUS FUMES REPORTED. REMOVED AND REPLACED L/H ENGINE REF B767 WORK CARD 7100000-01-04. LEAK AND OPS CHECK GOOD. A/C OK FOR SERVICE.