We have those supplier/factory warranties as well, they cover stuff that the laws don't.

Circuit board corrosion, if it's just over one year - that one is hard to believe - unless you had it out in the rain or out to sea in a gale. I have some electronics that are over 50 years old - with no corrosion what so ever that hinder their operation. If I were in your shoes, i would keep contacting Ketron relentlessly and claim it's their fault. One should expect a $400 product meant for proffesionals to last more than one year. Heck my old GEM CD 2 is 20 years old - it stills works like a charm - and it's Italian

DocZ