As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE AILERON AND RUDDER REVERSION LIGHT CAME ON, THE CREW ALSO NOTICED LOSS OF HYD PRESSURE AND QUANTITY. CREW ACCOMPLISHED PROCEDURES IAW QRH NR 27. DECLARED EMERGENCY LANDING WITHOUT FURTHER INCIDENT. MX FOUND CABIN AIR CHECK VALVE CLOGGED AND RT ENGINE HYD PUMP LEAKING FROM CASE DRAIN. THEY REPLACED RT ENG HYD PUMP AND CLEANED CABIN AIR CHECK VALVE. OPS CHECK GOOD IAW UAL MM 29-13-35 AND 29-14-11. ACFT WAS RETURNED TO SERVICE.