What was found
STRONG ODOR OF FUEL ON TAXI TO FL200. ARRIVL BLW130 PAX AND FWD CABIN COMPLAINING SMOKE ODOR REPORT. PERFORMED WALK AROUND BEFORE & AFTER ENG RUN. NO LEAKS FOUND. FIM TASK 21-00 TASK 806 SECTION C. REPLACED TWO HEPA FILTERS IN FWD PIT, RAN ENGS SEPERATLY ODOR STILL PRESENT IN CABIN. ACCOMPLISHED INTERNAL & EXTERNAL, INLET & EXHAUST INSP OF APU BAY, NO DEFECT NOTED, INSPECT FUEL SHROUD LINE & APU DUCT, AFT OF PRESSURE BULKHEAD, NO DEFECT NOTED, NO FLUID LEAKING OUT OF SHROUD, ACCOMPLISHED ENG IDLE RUN, WITH ENGS PNEUMATIC AS AIR SOURCE & PACK IN MULTIPLE CONFIGURATION, NO ODOR NOTED, WITH ENGS BLEED ON & TURNING ON APU BLEED, OILY ODOR NOTED IAW 21-00 TASK 830 & AMM 05-51-26-800-801-C1, PLACED ON MEL DUE TO ODOR IN CABIN FROM APU BLEED. SOURCE OF OILY ODOR HAS BEEN T/S DOWN TO APU BLEED AIR. INSP OF APU INLET, EXHAUST, FUEL SHROUD & APU BAY SHOWS NO LEAKS. SOURCE SEEMS TO BE COMING FROM INTERNAL OF APU. REQUIRES APU CHANGE.