What was found
LONG IDLE DESCENT. ON SHORT FINAL ENGINE POWER CAME UP AND HAD A FUME EVENT IN THE COCKPIT ONLY.-PFMD APU W/ PACKS 1 & 2, ENG # 1 & 2 RUN AT IDLE W/ PACK 1 & 2. COULD NOT DUPLICATE ODOR IN COCKPIT NOR CABIN. IAW TSM 05-50-00-810-831-A, AMM 71-00-00, GMM BOOK 1 APP B. AC OK FOR CONT AVS. MOC NOTIFIED.