I did not want to start another sttng question thread, but I am out of ideas.
When I got the game both cannons rotated on start up, like they should. I broke the small crank arm on the left cannon by physically hitting the cannon accidentally. (It was already broken and glued together by the previous owner)
I replaced the crank arm. In diagnostics, the cannon switches (home/mark) work correctly. When I boot the game the right cannon will rotate, and the left cannon does not rotate. Both cannons work fine in game modes, such as battle simulation and launch a probe.
If I shut down the game when the cannon is pointed at the playfield, it will find home when I start the game later.
All I can think of is the often mentioned wire harness, but the cannon works fine except for this start up test,
Thanks in advance!