As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING FROM A HOVER, WHILE PERFORMING MAIN ROTOR TRACK AND BALANCE, THE PILOT REPORTED NR 2 ENGINE OIL TEMPERATURE WAS CLIMBING TO YELLOW ZONE. MX INVESTIGATED AND DETERMINED THAT THE NR 2 TRANSMISSION DRIVEN OIL COOLER BLOWER WAS NOT ROTATING. DISASSEMBLY CONFIRMED THAT THE SPLINE DRIVEN BLOWER FAN SHAFT SHEARED.