As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 HYDRAULIC PRESSURE WENT TO ZERO IN FLIGHT WITH HIGH HYDRAULIC QTY. HYDRAULIC PRESSURE REGAINED WITH THE AUXILIARY PUMP ON IAW CHECKLIST, QTY RETURNED TO NORMAL. MAINTENANCE FOUND EXCESSIVE AIR IN RT HYDRAULIC SYSTEM AND ALSO NOTED GROUND CONTROL ACTUATOR VALVE LEAKING FROM FITTING. REPLACED HYD LINE WITH ALL SUBSEQUENT CHECKS GOOD.