call the kenwood company spares department first and ask if spares are still available for that model, then ask for the address of a service agent in your area
if there are no spares then sending it any where for a service may get a reply that it is unrepairable because of lack of spares
extremely unlikely as manufacturers stop carrying parts after 5 years and aftermarket suppliers and service agent after 10 years
you may get gears from alibaba site but the time taken , makes junking it for a new unit a better idea