No Ketron service center near here. Also no Korg service center near here. I had to take it to Dallas, about 200 miles. The service people there were great. It's Korg who could not or would not get me a joystick module for more than three months.
I finally hired an attorney to pursue a claim against them for loss of income, cost of buying a replacement keyboard and aggravation.
They miraculously got a shipment of parts in the next day and finally apologized. If I had it to do over, I would just use a joystick from one of the Korg synths and forget the warranty. They are exactly the same, but Korg wouldn't authorize using one. It's a $20. part and took ten minutes to replace.
In all fairness, I had a faulty Yamaha PSR S900 a few years ago. I called Steve Deming, and he had a new one shipped that same day!
There is a repair center that does Yamaha and Roland here. He could work on Ketron if they asked.
To be honest, the instances I've mentioned here are the only problems I've ever had using arrangers virtually every night since they were invented. Oh wait, I had a joystick spring break on a Roland G800 about a week after I bought it. We took the spring out, cut off the broken piece and put it back in!
I suppose it is still working somewhere.
DonM