What was found
FUME EVENT FWD CABIN DURING DESCENT. MUSTY/DIRTY SOCKS SMELL. REF AIR QUALITY REPORTING FORM. DESCRIPTION OF ODOR/FUMES: CONTINUOUS AND DISCOMFORTABLE, DIRTY SCOKS SMELL. APPARENT CABIN SOURCE: CABIN AIR SUPPLY VENTS. FWD AND MID CABIN. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-PER TSM 05-50-00-810-831-A PERFORMED AMM 21-00-00 LEVEL C REMOVAL OF CONTAMINATION PACK BURN OUT COULD NOT DUPLICATE FAULT. R&R RECIC FILTERS PER REQUEST OF MOC FOR PRECAUTION OK REQUEST OF MOC SVC NO DEF NOTED AT THIS TIME.