As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF AND LANDING LEVER UP WITH LIGHTS OFF THERE WAS STRONG VIBRATION IN THE NOSE WHEEL COMPARMENT. THE LANDING GEAR WAS CYCLED AND VIBRATION CONTINUED. ACTUATOR CYLINDER WAS REPLACED IAW AMM 32-22-01 PAGE 203. TEST WAS PERFORMED WITH SATISFACTORY RESULTS.