What was found
FLT#54, PBI-JFK. 'ENVIRONMENTAL SYSTEM ODOR PRESENT IN FLIGHT DECK ONLY WITH PACK 1 ON. ODOR DISSIPATES WHEN PACK 1 IS OFF. ODOR PRESENT DURING CLIMB AND APPROACH PHASES WITH PACK 1 ON. MUSTY ODOR; PERFORMED LEVEL A DECON OF THE ECS IAW AMM 21-00-00-615-802A. NO ODOR IS PRESENT AT THIS TIME. A/C OK FOR CONTINUED SERVICE. REF INFO NOTICE 2017-T015 I. TROUBLESHOOT PER TSM 05-50-000-810-831. FOUND TO BE A LEVEL 1 ODOR. LEVEL A DECON PERFORMED. APU PLACED ON MEL.'