As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1613 - EN ROUTE PHL-ORD, ON DESCENT HAD SYSTEM 1 HYDRAULIC QUANTITY LOW MESSAGE AND FAULT LIGHT. COMPLETED PROCEDURE WITH MANUAL FLAP AND GEAR EXTENSION. LANDED ORD WITHOUT INCIDENT. REPLACED RIGHT SPEED BRAKE ACTUATOR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)