As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC QUANTITY GAUGE INDICATION BEGAN DECREASING DURING DESCENT. EMERGENCY CHECKLIST WAS ACCOMPLISHED. HYDRAULIC FLUID QUANTITY STABILIZED AT THE STANDPIPE LEVEL. REPLACED NR 2 ENGINE HYDRAULIC PRESSURE LINE BULKHEAD FITTING. GROUND RAN ENGINE AND LEAK CHECK WAS GOOD. SERVICED HYDRAULIC RESERVOIR.