What was found
FLT#1402, FLL-JFK. 'DURING CLIMB OUT ONLY WE SMELLED A MUSTY ODOR FROM ALL COCKPIT VENTS. REPORTED AS LEVEL 1 TRANSIENT. NO ODOR IN CABIN AT ANY TIME. APPROX 20,000 TO 28,000 FT. ODOR REPORT FORM GIVEN TO MX IN JFK; PERFORMED LEVEL 1 ODOR PACK BURN VIA ENGINE AIR BLEED. RAN EACH INDEPENDENTLY & SIMULTANEOUSLY PER INFO NOTICE 2017-T015J. NO SIGNS OF ODOR WITHIN THE FLIGHT DECK. IN NORMAL CONFIGURATION FOUND NO ABNORMALITIES, CANNOT DUBLICATE DEFECT. NO FURTHER ISSUES NOTED. AIRCRAFT IS OK RETURN TO SERVICE.'