As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE HELICOPTER EXHIBITED OCCASIONAL OSCILLATIONSIN TORQUE, N1 & TOT. AFTER EXTENSIVE TROUBLESHOOTING AN OVERHAULED DOUBLE CHECK VALVE WAS INSTALLED AND PROBLEM WAS RECTIFIED.VALVE ASSEMBLY SENT TO STANDARD AERO LTD IN WINNIPEG AS CORE EXCHANGE FOR OVERHAULED UNIT RECEIVED.