As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EXECUTING A NORMAL APPROACH TO FOB. A JOLT WAS FELT AND THE COLLECTIVE BECAME VERY DIFFICULT TO MANIPULATE. "MASTER CAUTION" LIGHT ILLUMINATED AND THE AUXILIARY HYDRAULIC PRESSURE GAUGE WAS AT ZERO. THE AUXILIARY HYDRAULIC SYSTEM WAS SECURED AND A SAFE LANDING WAS PERFORMED. A HOSE IN THAT SYSTEM WAS FOUND TO HAVE RUPTURED. THE HOSE WAS REPLACED AND THE AIRCRAFT RETURNED TO BASE WITHOUT FURTHER INCIDENT.