As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, ENGINE VIBRATION FELT AND CONTINUED TO WORSEN UNTIL RUNUP, NR 1 ENGINE VIBRATION INCREASES WHEN OUT OF FEATHER. COMPLIED WITH INSPECTION IAW AMM 05-50-65 AND REPLACED NR 1 PROP ASSY IAW CARDS 61-10-06 AND 61-10-07 FOR BLADE R & R. RUN AND LEAK CHECKED GOOD.