What was found
BAD ODOR COMING FROM PACKS THROUGHOUT FLIGHT, BECAME WORSE DURING DESCENT (MUSTY DIRTY SOCKS ) SWITCHED OFF PACK 1 AND SMELL WENT AWAY. DESCRIPTION OF ODOR/FUMES: PERSISTENT, DIRTY SOCKS SMELL. APPARENT CABIN SOURCE: CABIN AIR SUPPLY VENTS. FWD CABIN AND FLIGHT DECK. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-C/W TSM 05-50-00-810-831-A FOUND ENG 1 PACK 1 TO BE CAUSE. PERFORMED DECONTAMINATION LEVEL A OF PACK 1 ENG 1 IAW AMM 21-00-00-615-802-A. NO ODORS OR FUME NOTED DURING DECONTAMINATION. A/C OK FOR SVC AT THIS TIME INSPECTION ENG 1 & 2 OIL LEVEL IAW AMM 12-13-79. OIL LEVEL GOOD.