Probably too late for you. But have you tried Neil Blake at Strawberry Music? His site has a couple of DVD Tutorials and I'll put another link to "getting the most from your Technics Keyboards' (I find the original CD Rom of this very useful). You might have to ask him though it looks like he's updating the original Technote CD Rom. I don't know how old these links are. Also Mike's TechnicsKN7000.com site has some really useful info on it, though it's not very active now. https://strawberrymusic.store.buegle.com/index.php/30/
I think he also sells on Ebay (haven't checked recently) http://books.technicskeyboards.com/