As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 966 ON FLIGHT 5150 FROM SOP TO CLT. DURING TAKEOFF ROLL THE LEFT ENGINE BETA LIGHT CAME ON AT 70 KTS. TAKEOFF WAS ABORTED AND THE AIRCRAFT RETURNED TO THE GATE WITH NO OTHER PROBLEMS. NO EMERGENCY PROCEDURES WERE USED. MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE BETA SWITCH. OPS CHECK WAS GOOD. AIRCRAFT RETURNED TO SERVICE.