As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC SYSTEM ONE FAILURE MESSAGE, CFR CALLED. RETURNED TO DFW. REMOVED AND REPLACED NUMBER FOUR BRAKE SHUTTLE VALVE AND TIGHTENED RESERVOIR REFILL CHECK VALVE AND LINE IAW EMB AMM. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.