As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. WHEN THROTTLES ADVANCED FOR TAKEOFF NR 2 ENGINE SPOOL UP LAGGED BEHIND NR 1 RESULTING IN ASYMMETRICAL THRUST. TAKE OFF ABORTED. FLIGHT CREW ACCOMPLISHED ENGINE RUN UP WITH ALL INDICATIONS NORMAL. SUBSEQUENT TAKEOFF WAS UNEVENTFUL.