What was found
ATL - FLT 1037 - SHORTLY AFTER THRUST WAS SET FOR TAKEOFF OUT OF PHL, A STRONG OIL SMELL WAS NOTICED THROUGH OUT THE CABIN. THERE WAS ALSO SOME HAZE IN THE CABIN. FLIGHT CONTINUED ONTO ATL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED A HIGH POWER ENGINE RUN. FOUND THE LEFT PACK EMITTING SMOKE INTO THE CABIN THROUGH THE NR 1 ENGINE BLEED. NO EXTERNAL LEAKS WERE NOTED. AIRCRAFT WAS RELEASED ON MEL 21-1A. MAINTENANCE IN PIT ACCOMPLISHED A NR 1 ENGINE BOROSCOPE THROUGH BLEED VALVES AND 5TH STAGE HIGH PRESSURE COMPRESSOR. FOUND EVIDENCE OF OIL LEAKAGE IN COMPRESSOR. REMOVED AND REPLACED NR 1 ENGINE ASSEMBLY. OPERATIONAL CHECK AND LEAK CHECK GOOD. CLEARED MEL 21-1A. (M)