As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN THE AIRCRAFT WAS PARKED FOR AN EXTENDED PERIOD IN MINUS 20-DEGREE WEATHER WITH THE PARKING BRAKES ON, A PUDDLE OF HYDRAULIC OIL WAS NOTICED UNDER AFT FUSELAGE. INVESTIGATION FOUND THE BRAKE SHUTTLE VALVE ASSY. WAS LEAKING, WHICH WAS THEN REPLACED.