As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED HYD SYS NR 1 DROPPED INTO AMBER RANGE IN FLIGHT AND RECEIVED A WARNING MESSAGE ON THE EICAS. THE ACFT DIVERTED AND LANDED WITHOUT INCIDENT. MX INSPECTED AND REPLACED THE NR 1 AND NR 4 BRAKE SHUTTLE VALVES. SERVICED HYD SYS AND OPS CHECKS WERE GOOD.