As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 2326 - EN ROUTE DFW-ORD, LEFT HYDRAULC FLUID QTY DROPPED TO RED BAND. ABNORMAL PROCEDURE FOR SLAT/FLAP EXTENSION ACCOMPLISHED AND AIRCRAFT LANDED ORD WITHOUT INCIDENT. REPLACED LEFT THRUST REVERSER CONTROL VALVE HYDRAULIC PRESSURE LINE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)