Called Yardman, and did get an initial answer. Then, they put me on terminal hold (terminal hold is where you go on hold and get old and die waiting for an answer).
However, they were probably buried this morning, after the long weekend. So, I'll wait until Thur and call again.
Well, the solenoid IS NOT inside the starter case. That's the good news. The bad news is I have a very bad feeling it's hidden away up under the center console.
And, this means I'll probably have to pull the deck to even get to the solenoid. Pulling those decks is no fun at all. It's not hard or difficult, just a pain in the patootie. Accessing the draft arm pins and disconnecting from the deck drive belt is no fun whatsoever.
I was able to check out the safety switch iin the seat. It's a normally closed switch, and when you take weight off the seat, it opens. Ours is OK.
What I haven't found is the PTO lock out switch. I have a feeling it too is up under the center console, and will require the deck coming out to give me access to check it.