As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1248, TPA-LGA. 'ON TAKEOFF VERY STRONG CHEMICAL /MUSTY ODOR IN FLIGHT DECK.FUMES/ODOR WERE MAGIC MARKER /SWEET SMELLING. ODOR WAS MODERATE AND INTENSITY PERSISTENT AND INCREASING FROM AIR VENTS. FCOM ODOR /ISOLATION PROCEDURE ACCOMPLISHED. ODOR BEGAN TO DISIPATE AFTER PACK 1 ISOLATED AND TURNED OFF. CONSIDERED LEVEL 2 BY FLIGHT CREW ( PACKS ).' (SUPPLEMENTAL INFORMATION TO FOLLOW)