What was found
SHIP 6811 NUMEROUS TIMES ON DESCENT AND APPROACH WITH POWER CHANGES FUMES SMELL. SMELL ALSO WITH APU USAGE ON GROUND ISOLATED ON GROUND BY TURNING OFF L PACK. SMELL IS "DIRTY SOCKS" "HYDROLYSED OIL / HYD FLUID". CORRECTIVE ACTION: T/S, R/R RECIRC FILTERS PER B757 AMM 21-25. UPON GVI INSP THE RT ENG, HYD COWL OPENING ACTUATOR WAS FOUND LEAKING OIL. R/R ACTUATOR PER B757 AMMM 78-31. OPS CK NML. FOUND EVIDENCE OF BIRD INGESTION ON #1 DURING B.S.I. AND PERFORMED GVI REF B757 AMM 72-00. NO EXTERNAL EVIDENCE FOUND OF BIRDSTRIKE. (4034690)