What was found
FOUL ODOR OCCURED DURING CRUISE AND DESCENT. TROUBLESHOT IAW NOTICE 2017-T015A, SECTION A. DETERMINED TO BE OF A TRANSIENT CONDITION, NO PERVIOUS REPORTS. R & R A/C ECS FILTERS DUE TO DAMPNESS AND DUST IAW AMM 21-21-40. OPS CHECKED OK WITH APU AND ENGINE BLEED AIR.