Again thanks all, I am so glad I found this place, and even more so that I didn’t try anything stupid yet.
I did call B&G and did get a replacement, but it still needs a new bonnect (the seal).
Guess what though, B&G tech said “yes you can remove the seal with active flow” <---- bad advice ?
But alas this is all but minor problem now as I discovered that the bonnet screws are solder to the valve body. Sylvan is this standard procedure ???
Now its seems to do anywork, they may have to cut the valve out an put in a whole new section (a big job).