What was found
PDX - ON FLIGHT 2034, IN CRUISE AND DESCENT THE AIR FROM THE BLEED SYSTEM STANK. ODOR WAS STRONG ON THE FLIGHT DECK AND NOTICEABLE IN THE CABIN. ODOR WAS STRONGER WHEN HOT AIR WAS SELECTED FROM THE ACM. MAINTENANCE INSPECTED ACM DRAIN LINE FOR OBSTRUCTIONS, CLEANED DRAIN LINE AND DRAINED WATER FROM SYSTEM. COMPLIED WITH ENGINE RUNS WITH BLEEDS HOT AND COLD. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.