As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN ROTOR TRANSMISSION OIL PRESSURE LIGHT ILLUMINATED DURING FLIGHT. IMMEDIATELY LANDED AIRCRAFT AND FOUND NO OIL PRESSURE BEING SUPPLIED BY LUBE PUMP. ON FURTHER INVESTIGATION FOUND METALLIC CHIP LODGED IN THE IMPELLER OF THE OIL PUMP RESULTING IN THE PUMP SHAFT SHEARING. REMOVED TRANSMISSION SIGHT GLASS AND PLUG ON RIGHT SIDE. FOUND RING GEAR HAS CRACK AND MISSING MATERIAL.