As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CENTER HYD SYS QUANTITY DECREASED FROM 1.04 PRIOR TO DEPARTURE TO .66 IN CRUISE, RF DISPLAYED. QUANTITY CONTINUED TO DECREASE TO .46. R & R NR 10 SPOILER PCA FILTER O-RING IAW AMM 27-61-02. SERVICED CTR HYD SYS IAW AMM 12-12-01. OPS AND LEAK CHECKS OK.