As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 20,000 FT A VERY LOUD BANG EMITTED FROM THE NOSE GEAR COMPARTMENT. FIVE MINUTES LATER THERE WAS A SECOND LOUD BANG. THERE WAS ANOTHER LESS VOCAL BANG ENCOUNTERED AND SEVERAL IN THE DESCENT. REMOVED LANDING GEAR MANIFOLD. INSTALLED MODIFIED MANIFOLD ASSY P/N 8218-2. OPS AND LEAK CHECK OF MANIFOLD CHECKS GOOD. WORK PERFORMED IAW CHAPTER 32-30-00 AND 32-30-02 OF THE CE750 MM.