Larry -
Both of my TMs (2002 and 2006) had aluminum frames, so looking for wood rot has not been something I've had to do. My thought was simply that it seems the simplest way to check. After all, you are going to remove a common 1-inch wood screw, look at it, and put it back. Then repeat for several more screws. I can't imagine that this would upset the owner.
Just in case I wasn't clear on where these screws are, I attached a picture. The red arrows indicate a line of screws driven upward into the underside of the bottom edge of the wall. You don't have to remove all of them -just enough to convince yourself that all is well.
Bill
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