I think my Plasma Lite interface board has finally just packed it in. What was happening from my end was the brakes were slamming on full but the engine was screaming at the same time (not IN brake zones, but several times coming out and starting down long straights). Happened a few times in practice, so I disconnected and then reconnected...and it seemed ok...
...and then after the bridge the pedal just wouldn't come up right either*.
[* there is no brake spring to break, btw. It's a DIY hydraulic load-cell configuration that been pretty solid for more than ten years, but it seems I bent or broke something]
Odd effects out of the board for the last few days too: The brake bias in AC was resetting itself back one click at a time, and it runs through the same circuit board...which had me wondering if it was "cross-talk" in the wiring or something.
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Leo Bodnar sells a similar board and he's still in business (unlike Leo LaCava), so it's time to get out the wallet I think.