As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REJECTED TAKEOFF. FLIGHT CREW REPORTED HEARING TWO "BANGS" WHICH WAS THOUGHT TO BE A COMPRESSOR STALL AND ABORTED TAKEOFF AT 50 KNOTS WITHOUT INCIDENT. CREW COULD NOT DETERMINE WHICH ENGINE WAS AFFECTED AS THERE WERE NO ENGINE INDICATION FLUCTUATIONS. MAINTENANCE PERFORMED AN ENGINE RUN ON BOTH ENGINES AND A BLEED SURGE VALVE SCHEDULE AND COULD FIND NO DISCREPANCIES.