What was found
FLT#1668, PUJ-JFK. 'DURING DESCENT THROUGH 4000 : SLIGHT ODOR NOTICED IN FLT DECK . ODOR NOTICED LATER IN FWD CABIN. ODOR CLEANED AFTER 5 MINUTES * NOTE * ENG #1 HP BLD OPEN, ENG # 2 HP BLD VALVE CLSD; REF LP 4068219, ITEM 1 (REF INFO NOTICE 2017-T015K. ODOR EVENT IS CONSIDER TO BE A TRANSIENT EVENT. PERFORMED LEVEL B DECON IAW TSM 05-50-00-810-831A. REF SMMS 36-10-00 & 21-00-00. NO ODOR PRESENT.), ODOR EVENT CONSIDERED TRANSIENT EVENT. LEVEL B DECON ACCOMPLISHED. RECIRCULATION FILTERS REPLACED. NO ODOR PRESENT. NO DEFECTS NOTED. A/V OK FOR SVC.'