I only have a moment, but don't worry about the F2 KET A02 error, there is a discrepency in the test program itself that gives a fail... Ketron are aware of this problem. It does not affect the keyboard in any way, its simply the test program is incorrect.
TWD this is just what I mean, little sippetts of info held by a numbers of people, perhaps a fact sheet would put peoples mind at rest, if I run CSUM test what will I get and my KB is OK. I don't gigg with my KB but some people the Audya is their working tool and if it falls over in front of 100s of people wooops.
I will run a test on my KB and be back shortly