As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING NOSE GEAR RETRACTION STRONG BANGING AND FLASHING UNSAFE LIGHT DURING MULTIPLE ATTEMPS ON OCF. ALWAYS DOES IT IN CLIMB, NEVER IN LEVEL FLIGHT. TO RULE OUT VIBRATION ON NOSE BY OUT OF BALANCE MAIN TIRES, TURNED OFF ANTI-SKID TAPPED BRAKES BEFORE RETRACTION-STILL DOES IT. REMOVED BRAKE METERING VALVE DUE TO INTERNAL FAILURE. INSTALLED NEW VALVE IAW MM CH 32-42-00, OPS CHECKED AND LEAK CHECKED GOOD.