Just curious, i've swapped some boards around and my high speed no longer checks for switch errors at start up.

It's pretty handy on that particular pin because the switches are finicky and seem to get out of wack after a few weeks of no plays.

I have an original system 11 board
11a
11b
All set up so they can work in high speed.

I kinda thought was a possibility, but i really never had to play with an error because it always reported when i had the 11a in there.
High speed doesn't really have that many switches and if one wasn't operation it would be easy to tell, which i knew right away when i put the original board back in and it didn't tell me the errors. I manually checked and they were there.

It also reported from day 1 with the 11a in it. That's not the board it came with, not even the same set of roms (if that matters)

The switches are pretty old and worn on my high speed (thinking about just replacing all of them) and i'd say since i had it at least 25% of the time i turned it on it had errors, which it reported immediately. I just don't think there was enough play without working switches to trigger the report.

Cyclone manual says 120 balls or 40 games.
For the most part i'm the only player and i usually only play a game or 2 at a time, so 40 games or 120 balls could take months.

Now it has the 11b in it, maybe i'll put the A back in and see what it does.