As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- NR 1 ENGINE AFTER SETTING TORQUE YAWED LEFT AND THEN ENGINE SOUND INCREASED DRASTICALLY. GLANCED AT GAUGES ON ABORT, POWER REDUCTION, ENGINES RETURNED TO NORMAL. NO WARNING LIGHTS. REMOVED AND REPLACED PCU AND TSCU. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.