As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 280 GOT LEVEL-1 "HYD 3 ELEV OFF" FLUID IN NR 3 3.5 GAL. SECURED HYD SYS NR 3 FOR LANDING. AFTER DIRTY UP LOST REMAINING FLUID FOLLOWED BY "HYD 3 FAIL" TOWED TO GATE. FOUND HORIZONTAL STABILIZER PRIMARY CONTROL VALVE LEAKING. R & R HORIZONTAL STABILIZER PRIMARY CONTROL VALVE AMM 27-43-03-4.