As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUN FLIGHT NR 2358, VIBRATION IN AIRFRAME WHEN PROPS BROUGHT OUT OF FEATHER ON STARTUP. MORE PRONOUNCED AS POWER LEVERS ARE ADVANCED TOWARDS FLIGHT IDLE. SEEMS TO ORIGINATE FROM NR 2 ENGINE. MAINTENANCE FOUND NR 1 PROP CAUSE OF VIBRATION. AIRCRAFT FERRIED TO PDX. MAINTENANCE REMOVED AND REPLACED NR 1 PROP ASSY IAW MTC 6610003 AND MTC 6610004. OPS TEST GOOD IAW Q400 AMM TASK 71-00-00-868-805. AIRCRAFT RETURNED TO SERVICE.