As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROTOR BRAKE CAS MESSAGE APPEARED SHORTLY AFTER TAKEOFF. FOLLOWED EMERGENCY PROCEDURES AND RETURNED TO DEPARTURE. TESTED SWITCHES IN CALIPER AND FOUND THEM TO BE SERVICEABLE. RECONNECTED CONNECTOR PLUGS AND PERFORMED AN OPS CHECK ON THE ROTOR BRAKE SYS AND FOUND SERVICEABLE. RETURNED TO SERVICE.