As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF & GEAR RETRACT, HEARD A LOUD CONTINUOUS THUMPING UNDER ACFT & RT MAIN GEAR LIGHT CHANGING FROM GREEN TO AMBER. RETURNED TO FIELD FOR LANDING. TRANSFERRED TO NRWC 635-ABI-02482. R & R RT UPLOCK BOX IAW AMM 32-33-10. OPERATIONS & LEAK CHECKED GOOD.