As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD 1 OFF LEVEL 1 ALERT, 15 MIN INTO CRUISE AT FL380. HYD 1 QTY LO AND HYD 1 PUMP 1R/1L OFF ALERTS CYCLED DURING CONFIGURATION. EMERGENCY DECLARED. FOUND A FITTING ON ONE OF THE NR 1 BRAKE SYS ACCUMULATORS IN THE LEFT WHEEL WHEEL LOOSE.