What was found
RTG FOR STRONG ODOR OF FUEL IN CABIN, CFR CONFIRMS FLUID LEAK. INVESTIGATED FUEL ODOR IN CABIN IAW AMM 05-51-26-800-801C1 CONDITIONAL INSP. UNABLE TO DETECT FUEL ODOR IN CABIN AFTER INSPECTING APU COMPARTMENT, LT & RT A/C PACK BAYS AND DISTRIBUTION BAY. RAN BOTH ENGINES UP TO 70% AND SUPPLIED BLEED AIR TO PACKS AND STILL UNABLE TO DETECT ANY ABNORMAL ODORS IN CABIN. NO FUEL LEAKS FOUND ON EITHER ENGINE. REPLACED LT & RT RECIRCULATION FAN FILTERS IAW AMM 21-25-01 AS PRECAUTION. LOG CLEARED.