As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PERFORMING BEFORE LANDING CHECKLIST FOR LANDING, LANDING GEAR INDICATION REMAINED AMBER AND FAILED TO TRANSITION TO GREEN, FOLLOWED BY A CONSTANT REPETITIVE BANGING SOUND HEARD AND FELT IN THE FUSELAGE. LANDING ATTEMPT WAS ABORTED AND QRH WAS CONSULTED. AIRCRAFT RETURNED TO DEPARTURE. EMERGENCY DOWN BUTTON WAS INITIATED AND LANDING GEAR RESPONDED WITH 3 GREEN DOWN INDICATIONS. LANDING WAS UNEVENTFUL. TROUBLESHOOTING PROBLEM AT THE TIME OF THIS REPORT.