As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 128/15 NOTIFIED MTC AT APPROX 2300E THAT RT SYS HYD WAS DOWN TO .43 AND FALLING. HAD CREW TURN OFF RT HYD AND FLUID LOSS STOPPED. CREW DECIDED TO DIVERT TO BOS. AFTER BOS MTC INSPECTED AIRCRAFT FOUND THE LEFT ELEVATOR-RT SYS PCA LEAKING HYD FLUID. REMOVED AND REPLACED LT ELEVATOR RT HYD SYS CTR POSITION PCA. OPS CHK AND LEAK CHK OK. ALL PER AMM. ALL RII REQUIREMENTS MET QC4021.