As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT DEPARTED TAXIWAY AFTER PILOT EXPERIENCED PARTIAL BRAKE LOSS WHILE RETURNING TO THE RAMP AFTER LANDING. DISCOVERED A STRETCHED PILOT'S CONTROL CABLE TO BRAKE PROPORTIONING VALVE, WHICH IN TURN LOWERED THE AIR PRESSURE AVAILABLE TO WHEELS.