Update: I did purchase a rebuilt unit from Beckmann ( http://www.beckmanntechnologies.com ). They have an exchange program for $760. BBA was $400 for the exchange, but after speaking with Andrew at Beckmann I felt very good about their knowledge, level of service, and competency. Nothing against BBA, I was just impressed with Beckmann and appreciated J.M.'s experience as well.

I was happy with the experience and the part arrived in good order and worked on the first try. I have good ETA operation again, the car is very driveable and I'm back to code 42 on pin 8 as before.

So, I still have the ABS/ASR lights on, and no ABS/ASR functionality, but the car runs and drives very well so I can keep troubleshooting while I use it.

I replaced the brake switch as well, to no effect.