As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CENTRE HYDRAULIC QUANTITY WENT TO 0 AFTER FLAP SELECTION 1, ON FINAL APPROACH. QRH APPLIED, AIRCRAFT LANDED SAFELY. AFTER INVESTIGATION, FOUND TH RAT CHECK OUT MODULE (RAM AIR TURBINE) CHECK VALVE CAP SHEARED (CAP COMPLETELY SEPARATED FROM THE REST OF THE HOUSING).REPLACED RAT UNIT CHECK OUT MODULE, AS PER BOEING TASK 29-21-11-004-042 OPERATIONAL CHECK CARRIED OUT, FOUND SERVICEABLE.