As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE ACFT DEPARTED, THE MASTER CAUTION LIGHT ILLUMINATED. THE HYDRAULIC PRESSURE INDICATED BELOW 2000 PSI. FLIGHT DIVERTED. THE LANDING GEAR WAS EXTENDED BY THE ALTERNATE MEANS AND THE ACFT LANDED. THE ACFT WAS GROUNDED. MAINTENANCE FOUND A SMALL LEAK IN A HYDRAULIC LINE THAT SUPPLIED HYD PRESSURE TO THE TAIL ROTOR.