What was found
INTERMITTANT AIRSYSTEM ODOR INFLIGHT W/PACK 1 MELED INOP & PACKS 2 & 3 ON. PACK OUTLET TEMPS #2=33F,#3=133F. COCKPIT TRIM AIR VALVE=110, ODOR NOT NOTICABLE WHEN PACK #2 TEMP IS BELOW 0F,COCKPIT TRIM AIR VALVE BELOW 70 F. INSPECTED AIR CONDITIONING EXIT DOORS FOR OIL LEAK, NO OIL EVIDENT. CLEANED AIR CONDITIONING PACKS AND DUCTS AND REMOVED AND REPLACED #2 AND #3 PACK WATER SEPERATOR COALESCER BAGS. NO SMELL NOTICED WHILE RUNNING PACKS.