As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPEN WARNING MESSAGE. CW QRH. ON HYD SYNOPTIC PAGE, #3 SYS SHOWED 300PSI, 70% QUANTITY AND BOTH HYD PUMP OFF. SYS 3 HYD SWITCHES SET FOR TAKEOFF. WITH FLAPS SET TO 8D DEGREES. PUMP CB'S WERE IN. AT GATE, QUANTITY SHOWS 70%. NO OBVIOUS SIGNS OF LEAKS NOTED. ***AIRCRAFT REMOVED FROM SERVICE*** R&R #3 HYD RESERVOIR IAW AMM 29-12-30. REF TO 319015/2 FOR REST OF INSTALLATION STEPS REQUIRED.