I think you have reached the point where you need to cut some traces as Modemhead suggested to see if the dc is coming from U4.
It looks likely that U4 is toast.
or at least, part of it is. since the higher ranges for DCV work, as well as DCmV, Ohms, etc.
Yeah, I'll just have to bite the bullet and cut them. Just for completeness sake I think I'll pull one of the MOVs too just to make sure they're not bad it some weird way.
Guess the real question is, if U4 is bad, do I keep the meter and use the ranges that work, or do I turn around and sell it on eBay as a parts unit?