As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PROPELLER SURGING, TORQUE FLUCTUATED PLUS/MINUS 3 PERCENT WITH ITT INCREASING AND DECREASING PLUS/MINUS 5 PERCENT WITH TORQUE. REMOVED AND REPLACED RIGHT PROPELLER CONTROL UNIT IAW SAAB AMM 61-20-05. PERFORMED OPERATIONAL CHECKS IAW SAAB AMM 61-00-00 AND 71-00-00 WITH NO DEFECTS. AIRCRAFT RETURNED TO SERVICE.