What was found
FLT#803, JFK-SJU. 'STRONG FUMES ODOR ON DESCENT- THRUST AT IDLE PACKS ON APU OFF IN FLIGHT DECK AND CABIN BELOW 10,800 FEET; PERFORMED LEVEL B DECONTAMINATION AS PER TSM 05-50-00-810-085-B AND INFO NOTICE 2017-T015J STEP B2, COMPLIED WITH GROUND UNIT . R/R RECIRC FILTERS AND OZONE FILTERS PER AMM 21-21-41 AND 21-51-41, PERFORMED IDLE RUN ON LEFT AND RIGHT ENG WITH PACKS RUNNING. AIR QUALITY GOOD. APU FOUND TO BE THE SOURCE OF THE ODOR EVENT. TO BE PLACED ON MEL.'