As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DESCENT INTO SMO CREW OBSERVED THE GEAR UNLOCK LIGHT ILLUMINATED AND A DISTINCTIVE SOUND FROM NOSE GEAR AREA. THIS OCCURRED AT FL 26, FL 20 AND FL 11.5. REMOVED AND REPLACED INOP LANDING GEAR CONTROL MANIFOLD. PERFORMED OPERATIONAL AND LEAK CHECK IAW CESSNA 750 MM CHAPTER 32-30-02.