Just for your info.
I bought a Tempest PCB a couple of months ago on ebay us.
Initial conditions:
some 137004-001 missing,
3 not working PROMs on aux board
Vector prom on main board missing
So thanks to ebay and arcadechips I completed the board with missing parts, reprogramming the PROMs when needed...
Once it was completed I had this test screen (not in test the game reset).
In the beginning looking at all of those "0" aligned I thought to a problem related to the bus between program data and vector data