In terms of depot allocations they’re all maintained at Newton Heath, I can’t recall a single time that a 195 has been to Neville Hill, although I have seen a 3-car unit go to York Siemens Trans Systems, but that was before they operated passenger services to and from York.
I’m not sure if there are any 3-car units that are stabled at Holbeck sidings, although it is quite common to have a two-car unit stabled there after detaching from a 3-car unit that would have worked a peak Calder Valley line service.