Did you stop at that bolt?
Perhaps luck had you go to the worst one first?
Try the others. If your luck changes, perhaps you will just have that first one still holding on. With the rest of the ones out, some header wiggle might encourage the SOB to break free.
Of course heat is your friend with sticky bolts, but I know room is at a premium around those bolts and getting a torch, O/A or propane, in there will be tough.
Good luck
Larry
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