As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SYSTEM B HYDRAULIC QTY SLOWLY DROPPED TO O% DURING FLIGHT; QTY REACHED 0%AS FLAPS WERE EXTENDED TO 5;HYDRAULIC LOW PRESSURE LIGHTS DID NOT ILLUMINATE<[01] REMOVED AND REPLACED O-RING ON B SYSTEM ACOUSTIC FILTER IAW SPAM 20-10-17; SYSTEM OPS CHECK OK IAW M.M 29-11-27