What was found
DIRTY SOCK ODOR REPORTED BY F/AS IN THE AFT CABIN. ODOR NOT NOTICEABLE IN THE COCKPIT. THE AIRCRAFT WAS GROUNDED. MAINTENANCE ACCOMPLISHED SMOKE ODOR FUMES MCM CARD 05-96-70 AND FOUND SEVERED GRAY WATERLINE LEAKING ONTO RECIRCULATION FILTER. REMOVED AND REPLACED THE GRAY WATER LINE AND LEFT RIGHT RECIRCULATION FILTERS IAW AMM 21-25-01, RAN AIR CONDITIONING SYSTEM FULL HOT COLD, NO ODORS FOUND.