What was found
FUMES IN COCKPIT AND CABIN USING NR 2 PACK THRU 1-2 PNEU ISOL VALVE. *S/D* NR 2 BLEED WAS DEFERRED INOP DUE TO A PRESSURE INDICATION PROBLEM. THE NR 2 PACK WAS RUN OFF THE NR 1 BLEED VIA THE 1-2 ISOLATION VALVE. THERE IS NO HISTORY OF A FLUID LEAK FROM THE NR 1 ENGINE PRIOR TO THE INCIDENT, ALTHOUGH THERE IS SOME HISTORY OF AN OIL LEAK FROM THE APU. SOURCE OF FUMES MAY BE FROM INGESTION OF OIL BY THE APU, CONTAMINATING THE SYSTEM. THE NR 2 PACK SYSTEM WAS BURNED OUT. THERE HAS BEEN NO RECURRANCE.