Hard to find find!
The Selectra models were the electronically controlled models. If I am not mistaken, the first ones were the 20 series and ended with the 23's. I knew someone who had the venerable KDS17 for years and when she redid her Kitchen in their vacation home, she loved the look of the Selectra 20 and went out and bought it. It wasn't more than 2 years old and she had already had 2 controllers replaced. K/A stood behind it but she said she wished she had another 17 to swap it with!
I picked up a KDI-21 Selectra at a curb one day and it too, had a dead controller. More specifically, the pump relay had overheated and taken out the board. The replacement at the time was well over 400 bucks so I just turned it into a regular Imperial model and sold it.
Recently, I found a 23 Selectra and it too, had a defective board and that one had a price higher than a new machine! And it was no longer available.
In retrospect, I guess the boards lasted about as long as we have come to expect the current crop of electronic controllers to last. Heat and moist environments are not the best places to mount these things!
I think Andrew in Orlando has a 23 Superba Selectra and I know he liked it. And it is still running!