What was found
(CAN) THE FLIGHT CREW REPORTED A STAB TRIM CAUTION MSG WITH THE NR ON STAB TRIM OFFLINE. THIS WAS FOLLOWED QUICKLY BY THE MACH TRIM & AUTOPILOT NO MSGS. THE FLIGHT CREW REPORTED FOLLOWING THE QRH & THAT THE STAB TRIM DID NOT RE-ENGAGE. THE FLIGHT CREW FELT THAT THEY DID NOT HAVE FLIGHT AUTHORITY & THEY DECLARED AN EMER THE ROLL DISCONNECT WAS PULLED & THE FIRST OFFICER REGAINED FLIGHT AUTHORITY. AFTER LANDING, THE RT BRAKES BOTH INDICATED AN OVERHEAT IN RED.