Re: Framing question
No, you don't; not without a structural engineer. You muffed it the first time, now do it right. 16' is a long span for a summer beam that's only 10" deep. I'm guessing this is a flush beam? You want to take one side off, add steel (3/8?; 1/2?; 3/4?) in the middle, recut all the joists on one side and then cap the second LVL back on, then bolt the whole thing together with carriage bolts to the pattern determined by the PE.
Remove not the ancient landmark, which your fathers have set.