If you have a compatible module they will do an exchange so you can have no downtime. (I'd you are USA / Canada).
Most of the threads I've followed with mystery abs Gremlins start with replacing a couple wheel modules and end with happy factor once the module is replaced.
Rather than use a similarly aged used from a junk yard I definitely recommend fixing. This guy apparently developed some improved method to attach the welded interconnects. Repair your actual module also means no programming required.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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