What was found
FOUL ODOR IN COCKPIT AND CABIN FROM PREVIOUS WRITE UPS. OCCURS DURING SLOW AIRSPEEDS, HIGH POWER SETTINGS, SMELLS LIKE PETROLLIUM JELLY OR OIL IN PACKS. REMOVED REPLACED BOTH LT AND RT COALESCER BAGS IAW 21-54-08, PULLED AND COLLARED CIRCUIT BREAKERS U35, & S38. REMOVED TWO NR 1 ENGINE BYPASS DUCT ACCESS PANELS. REPLACED THE PACKING ON FRONT BEARING VENT LINE. CHECKED BUFFER AIR VALVE FOR FREEDOM OF MOVEMENT, NO DEFECTS NOTED. INSPECTED ECS DUCTING, NO OIL FILM NOTED. TAXIED AIRCRAFT, ACCOMPLISHED HIGH POWERED RUNS AT VARIOUS POWER SETTING AND VARIOUS PACK TEMP SETTING, NO ODORS NOTED. AFTER 1 HOUR. OKAY FOR SERVICE.