Local dealer had rebuild . $99. Plugged in, followed instructions, called and activated new, deactivated old , waited for it to finish and voila, it's back. Original e,az,s worked (glad I wrote it down. Linked Joey's and all is good. Even though it cost some money, at age 66 I welcome exercises for my brain as well as the exercise going up and down the ladder. Thanks for the the dealer idea and thanks to all for your help and suggestions. Best regards, Bart
PS In diagnostics my switch designation changed to dpp1k.2 where before it read something else.