As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON NORMAL LANDING GEAR RETRACTION, NOSE GEAR WOULD RETRACT AND SOON AFTER (10 MIN) AUDIBLE BUMP WAS HEARD WITH NOTICABLE VIBRATION. APPROX 10 MIN LATER SAME SOUND & VIBRATION WAS HEARD A SECOND TIME, BUMP & VIBRATION WAS NOTED IN ALL PHASES OF FLIGHT. ITEM IS UNDER INVESTIGATION.