As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, CREW NOTICED AMBER ALERT LEVEL 1 HYD QTY SYS 1, QTY GOING LOWER. A/C DIVERTED TO CCS. LANDING NORMAL. MX FOUND O-RING CUT AND SQUEEZED OUT ON NR 1 EDP LOW PRESSURE SWITCH. REMOVED AND REPLACED O-RING IAW 29-12-34. SERVICED NR 1 HYD SYS IAW 12-13-02, RUN UP AND LEAK CHECK GOOD IAW 29-00-00. A/C RETURNED TO SERVICE.