The pictures below show how the previous owner of my home complete transected one of the 2 2x10's making up this header. This header carrys the load of the ridge beam via the triple 2x4's pictured. The 2x4 on the flat is directly over a triple 2x8 joist downstairs. Any thoughts???
If you have found it, why haven't you put in some jackstuds or kingstuds to fix it. Some things should just be left unsaid to the Interwebs, and should be fixed and people move on to other things.
BTW, it appears that it is not even load bearing, so does it really matter. Then again, who knows what other hidden gems are in that place. This is why I am going to keep this house that we have, because I know that know one screwed with it during the years, and it has pretty much been unchanged, minus the wall that we properly removed between the Kitchen and dining room.
Well, that header is compromised for sure.
Move the AC unit and replace the header.
That would be a repair bringing it back to original conditions.
Otherwise, get an engineer to design a solution to use the two parts of the header that would probably include new load paths to the foundation.