What was found
GOT BURNING OIL/RUBBER/STEAM ENGINE/FIRECRACKER SMELL ONE MINUTE AFTER PACKS TURNED ON AND ON DESCENT WITH THROTTLES AT IDLE PASSING FL180. PACKS ARE SUPER LOUD- SUSPECT SOME VALVE ISSUE OR LEAKAGE INTO DUCTS. COMPLETED. T/S SYSTEM REF FIM 21-00-21-2 TASK 803 PROCEDURE 3. INSPECTED INTERMEDIATE PRESSURE MANIFOLD & HIGH PRESSURE MANIFOLD DUCT FOR EVIDENCE OF OIL, NONE FOUND REF AMM 36-11-06-4-1. PERFORMED AIR CONDITION OIL/SMOKE & FUME CONTAMINATION REMOVAL PROCEDURE FROM THE LEFT ENGINE REF AMM 21-00-21-2. NO DEFECTS NOTED.