Hi Chris,
What I did in a similar situation (different switch, different country ) was to contact the dealer I bought the KN from and ask him for the details of the service person that he used for Technics. You should find that he has all the manuals, parts lists etc, and the knowledge to fix your problem. I regard that phone number as worth it's weight in gold. I also bought a hardly used KN7000 as a spare about the same time. Also worth it's weight in gold!!!
Hey the best thing about the Tyros might be that it brings some good 2nd hand KNs onto the market
Good luck
Regards to all
Eddie