As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH TO KOBE GEAR SELECTED DOWN 'GEAR DISAGREE' MASTER CAUTION MAINS NOT DOWN AND LOCKED. CYCLED SYSTEM WITH SAME RESULTS. PERFORMED MANUAL GEAR EXTENSION PER QRH. 3 GREENS HOWEVER MANUAL GEAR RELEASE LEVER WOULD NOT STAY IN UP POSITION. EMERGENCY DECLARES AND DIVERTED TO KPBI. LANDING WAS UNEVENTFUL. MAINTENANCE TROUBLESHOT THE DISCREPANCY TO A FAULTY LANDING GEAR SELECTOR VALVE. VALVE REPLACED AND SYSTEM OPERATIONAL CHECKS WERE PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.