As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THREE ABORTED TAKEOFFS DUE TO CREW REPORTS OF PROP "SURGING" AND FAIL TO REACH 1020 RPM. MX REPLACED THE PCU, PEC, OSG, AND THEN REPLACED THE PROP ASSY. AFTER REMOVING THE PROP ACTUATOR CYLINDER ASSY, DETERIORATION OF THE PISTON SEAL AND BACKUP RINGS WERE FOUND.