(In reply to Andy Furniss from comment #1)
> If I had more builds I guess I could narrow it down like that - but I don't
> and I don't know how get the historic head versions from git - is that
> possible?

Maybe I completely misunderstood your question but did you try "git checkout
<COMMIT>"? As far as I can see the main challenge might be to get these commit
ids as the DAL branches are rebased regularly, right? "git reflog" might be an
option but it might be a bit tedious to search through the big amount of
commits.