I recently bought a non-functioning KSB2. Along with the board the seller supplied two U1 controllers with the latest firmware 1.08B. I was able to get the KSB2 working and verified that both U1s were working OK. If anyone would like this, I guarantee it's in working order and will ship it for $15 postpaid to any US zip code (more for international). These currently sell for $29 plus shipping from Elecraft:
FWSSB
KSB2 F/W Upgrade to 1.08 $29.00
(1.08 adds a 0.2 second VOX delay to the existing 1.0 and 0.4 second delays.)
(1.07 added KPA100 support to version 1.04.)
http://www.elecraft.com/order_form_parts.htm#K2%20PartsSorry but I don't know the difference between 1.08 and 1.08B.
Please contact me off-list if interested.
73, Bill W4ZV