As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDR - FLIGHT 2307 - THE AIRCRAFT RETURNED TO GATE WHEN THE NUMBER 3 HYDRAULIC QUANTITY DROPPED TO FORTY PERCENT AFTER COMPLYING WITH THE ISO VALVE CHECK. MAINTENANCE INSPECTED THE AIRCRAFT AND SERVICED THE NUMBER 3 HYDRAULIC SYSTEM. NO PARTS WERE REPLACED.