Tell me again why you concluded it was wood rot?
When you back them out, do they have machine screw threads, or wood screw threads? Are the threads tapered toward a pointy tip, or constant diameter all the way to the end? Incidentally, lag bolts are wood screws, and have coarse sharp wood screw threads, not machine screw threads, so we may be mixing terminology in this discussion.
Again, when you back them out, do you see rotted wood "crumbs", probably black, on the threads? If you push them back up into place, can you then tighten them by hand into what feels like steel machine screw nuts?
Bill
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