As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN FLIGHT AT 43000 FT, THERE WAS A BANG OR NOISE WITH VIBRATIONS FELT THROUGH THE FLOOR. IT APPEARED TO BE FROM THE NOSE COMPARTMENT, POSSIBLY THE NOSE GEAR. REMOVED AND REPLACED GEAR MANIFOLD IAW CE750 M/M CHAPTER 32-30-02. SYSTEM OPS CHECK GOOD.