I know its not a fix but at least you can get an MOT on it if you use one of these
https://www.ebay.co.uk/itm/284391834...gaAgm4EALw_wcB
ECU repair and a lot of these companies know the common problem with BOSCH ABS Ecu's is dry soldered joints and cracked solder, once they have a go at doing this they rarely try anything else.
I had the same problem on a Saab a few years ago.