What was found
FLIGHT 2304. DIRTY SOCK SMELL NOTED THROUGHTOUT FLIGHTDECK AND CABIN. REMAINED CONSISTENT AND CONTINUOUS ON GROUND AND DURING FLIGHT. DURING FLIGHT BOTH PACKS AND BLEEDS WERE ON. ON GROUND APU WAS SUPPLYING BLEED AIR REMOVED FROM SERVICE. PEFORMED INTERIOR/ EXT GVI. FOUND NO DEFECTS. OPERATED RECIRC FANS FOR 5 MINS. ALSO OPERATED APU BLEED AIR FOR 5 MINUTES IN BOTH COLD AND WARM TEMPERATRES. NOTED NOTHING UNUSUAL AND NO ABNORMAL SMELLS. PERFORMED GROUND ENGINE IDLE RUN ONE ENGINE AT A TIME. NO UNUSUAL AND ABNORMAL SMELLS NOTED. RETURNED TO SERVICE. COULD NOT DUPLICATE,