As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED CONTINUOUS TRIPLE CHIME TAKEOFF FLAPS AUTOFEATHER WARNING MESSAGE AT CLIMB POWER. REDUCED POWER & WARNING WENT AWAY. RESUMED POWER ABOVE 50% TORQUE & THE WARNING ENSUED. FLT#5432 REPLACED THE NLG AIR GROUND SENSOR IAW AMM. PN: 2S-00417-02