Reprogramming AIS 500

I am trying to reprogram my AIS 500 with a new MMSI number and boat name and details. The previous owner’s information remains in the unit after I add my details via the Raymarine software and the serial cable. Does this unit have to go to Raymarine for reprogramming or can a local certified installation technician do it? If it has to go back, do I follow the normal repair return procedure? Thanks for any help that you can provide.
Best wishes,
Brian

Apologies if this is a duplicate post - the browser window crashed when I hit send.