Bad luck, Mike.
I think a first stop could be have a search through Fiat Forums, here…
https://www.fiatforum.com/ducato/
Failing that, maybe a chat with these guys? Here…
https://tinyurl.com/y98uzsak
or
https://tinyurl.com/c7h5ds
or
https://tinyurl.com/gwd38p4
Although these people specialise in ECU and other automotive electronics, they may also take on your fault or even have experience of it.
Failing them, there are lots of “circuit board repair” places on the internet, like this one…
https://tinyurl.com/y72qteve
They presumably have the equipment, knowledge and parts to carry out a delicate repair like this.
Good luck, and let us know how you get on with this, Mike?
Barry