As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT HYD SYS QTY WENT TO "0" ON DESCENT. QRH PROCEDURES FOLLOWED, TOWED TO GATE. REMOVED AND REPLACED RIGHT MLG RETRACT CYC AND GLAND ASSY IAW AMM 32-33-01 AND C/W EA 17-32-009211R, OPS CHECKS GOOD. NO LEAKS NOTED C/W BOEING SERVICE BULLETIN 717-31-0013.