As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/CMH - FLT 7452 - DURING TAKEOFF, AIRCRAFT ABORTED TAKEOFF DUE TO CWS CONTINUOUSLY SOUNDED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND FOUND EMERGENCY BRAKE CONTROL VALVE MICROSWITCH OUT OF ADJUSTMENT. MAINTENANCE ADJUSTED MICROSWITCH. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)