As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL BETWEEN V1 AND VR THE COCKPIT FILLED WITH A STRONG BURNING ODER. THE CREW ABORTED TAKEOFF AND RETURNED TO BLOCK. MAINTENANCE INSPECTED THE NUMBER ONE AND NUMBER TWO ENGINE INLETS, OUTLETS AND PNEUMATIC DUCTS FOR RESIDUES. MAINTENANCE INSPECTED LEFT AND RIGHT ACM DUCTING. NO DEFECTS FOUND. GROUND RAN BOTH ENGINES AND DETERMINED ODER WAS GENERATING FROM THE LEFT AIRCONDITIONING PACK. DEFERRED LEFT AIRCONDITIONING PACK IAW 21-1A.