As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL, RT ECS OVERHEAT CAS MESSAGE ILLUMINATED. ABORTED T/O AND RETURNED TO GATE. INSPECTED SYSTEM AND DEFERRED RT AIR CYCLE MACHINE IN ACCORDANCE WITH MEL. LATER TROUBLE SHOT SYSTEM AND FOUND OVER TEMP SWITCH TO BE DEFECTIVE. REMOVED AND REPLACED SWITCH. OPERATIONAL CHECKED GOOD, CLEARED MEL. AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.