But does it test good in a real game situation? If it's not registering in the down position, then it might say that. And it might pop it up at diffren't times anyway, like when you lock a ball or start new ball etc.

Make sure to do it test mode with PF down and hit it with a ball.

Hmm....was it recently "dickered" with? I assume since last week you've played it and activated it enough that it would clear the error if something had changed.
Maybe something I'm missing also...anyone?

It should almost always be up, unless the lock is lit or arrow in that lane is lit.
When you knock it down, lock lights.
Skydive mode it will open.

Probably clear itself after some playing.

I would do a factory reset if I were you.