Ends up it was a small issue with a single file in the forum software but it took me a lot of head scratching to find it... actually, I never did find it, I had to ask for some professional help to look at the errors to address this and when I tried moving the software to another server the site still didn't work.
Sorry it took so long to get working but I have been traveling and on the road I didn't have access to everything I needed to do the server backups
It's been a long and frustrating couple of weeks!
Glad to get this back up without having to do a roll-back!