What was found
STRONG DIRTY ODOR FROM AIR CON, STARTED AROUND 15K FT & LASTED UNTIL LANDING. FOUND OIL PUDDLE IN AFT TURBINE SECTION ON NR 1 ENGINE. PERFORM CONDITION INSP IAW AMM 05-51-26-800-801 -C1 ODOR STILL PRESET NOT AS STRONG WITH RT PACK OFF, NO SMOKE ODOR. ABSERVED RT PACK TEMP 90C. REPLACED RT RECIRCULATION AIR FILTER IAW AMM 21-25-01-400-801. AWAITING ENGINE RUN. CHECKING RT PACK ON, ODOR PRESENT, WITH RT PACK OFF, NO ODOR PRESENT, WITH LT PACK ON, NO ODOR PRESENT.