Dans 01,
I would ohm out your wheel speed sensors first just to make sure, before you unseal your EBTCM, there is only 2 wires and you should read between 600 and 2400 ohms. Here is a video of a Bosch 5.3 not sure which EBTCM model you have. VW Audi Bosch motronic 5.3 ABS repairing - YouTube
So there was a change from 5.3 to 5.4 so they may not have the small wires that are being resoldered here. And your right about MM not retesting certain EBTCM's after they are done with their fixes, however if you get your reworked EBTCM and it doesn't work you can return it and they will send you a known good one I believe.
I have the same issue with my car so I need to replace/repair my EBTCM also. I did price one at the junk yard here in Iowa and they wanted $170 for the whole assembly, which includes the ABS modulating pump along with the EBTCM. Said if it doesnt work to return it for full refund. May be a route to go if you haven't checked into it.
Good luck, let us know what you come up with.
