As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD T702/23 EN ROUTE DEN-ORD RIGHT HYDRAULIC QUANTITY DECREASED TO 4 QUARTS. RIGHT QUANTITY WENT TO ZERO AFTER GEAR WAS EXTENDED. LANDED ORD WITHOUT INCIDENT. REPLACED RIGHT HAND ELECTRIC AUXILIARY HYDRAULIC PUMP. SYSTEM GROUND CHECKED NORMAL OPERATION.