As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, CREW OBSERVED 'A' SYSTEM HYDRAULIC FAILURE. HYDRAULIC QUANTITY AND PRESSURE READ ZERO. ALL COM PROCEDURES WERE COMPLIED WITH AND LANDING WAS UNREMARKABLE. INSPECTED AND FOUND A BLOWN O-RING ON THE NR 2 ACTUATOR FOR THE SPOILER. REMOVED AND REPLACED THE SPOILER ACTUATOR O-RING AND SYSTEM CHECKS GOOD IAW MM 276100.