As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER A FLIGHT OF 3.7 HOURS, WHILE DOING THE DAILY INSPECTION A LARGE PATCH OF OIL WAS FOUND UNDER THE HELICOPTER. THE BELLY WAS COVERED BY OIL. INVESTIGATION REVEALED 2 TUBES FROM THE TRANSMISSION TO THE OIL COOLER HAD CHAFED AGAINST EACH OTHER AND WERE CHAFED THROUGH. THE TUBES WERE REPLACED AND A/C RETURNED TO SERVICE.