What was found
AFTER TAKEOFF AND CHANGE OVER FROM APU AIR TO ENGINE AIR GOT HEAVY SMOKE IN FLT DECK, WHEN NR 1 PACK WAS SELECTED ON. SELECTED NR 1 PACK OFF, SMOKE DISSIPATED. RAN QRH, RETURNED FOR LANDING. ACFT TO BE FERRIED, FOR NR 1 ENGINE REPAIR/REPLACEMENT. MX INSPECTED PACK ASSY, FOUND OK. FOUND NR 1 ENGINE OIL LEVEL 2 QTS LOW. SERVICED OIL, RAN FOR 1/2 GR AT CRUISE POWER. CONSUMPTION AT 1/16 QT PER HOUR. SUSPECT NR 2 LAB SEAL LEAK. ACFT SAFE FOR NR 4 ENGINE FERRY FLIGHT. A/C TO BE FLOWN WITH NR 1 PACK OFF (CURRENTLY REMAINS DEFERRED) NR 1 ENGINE BLEED OFF UNLESS REQUIRED FOR AIRFRAME ANTI-ICE. REPLACED NR 1 ENGINE P/N 2-003-040-15, S/N OFF P07892, S/N ON P07723. REF WORK PKG DATED 4/3/03 FOR DETAILS.