What was found
AFTER ENGINE START AND WHEN THE PACKS WERE PLACED ON, WE GOT A CALL FROM THE CABIN THAT PAX SMELLED STRONG FUEL/ENGINE EXAUST SMELL AND WERE HAVING A HARD TIME BREATHING. PLACE PACKS ON APU BLEED AND THEN THE CABIN REPORTED THAT THE SMELL WENT AWAY. FLAGGING SDR TROUBLE SHOOTING CARRIED OUT IAW AMM 05-51-56-940-801-C1 FUME/ODOUR EVENT CONDITIONAL INSPECTIONS. INSPECTIONS COMPLETE REF LP 8048700. NIL FAULTS/ODOURS DETECTED DURING ALL TESTING. BOTH ENGINES AND APU RAN USING BOTH PACKS. NO FAULTS FOUND. RECICULATION FILTERS REPLACED AS PRECAUTION REF LP 8050313. UPON CONSULTATION WITH TOMC PP AC RELEASED BACK TO SERVICE.