What was found
ATB/FUME - RETURNED TO JFK DUE TO ODOR IN CABIN. P-TRAK SNIFFER RESULTS INDICATE APU AS SOURCE OF THE ODOR. COMPLETED LEVEL B ECS DECONTAMINATION. DEFERRED APU PER MEL 49-10-01A. LATER, COMPLIED WITH CLEAN APU AIR INTAKE AND COMPARTMENT PER WORK CAR 4916-2001. NO LEAK FOUND, PERFORMED P-TRACK TEST, NO ABNORMAL ODORS. (LP 7360328, 7360336)