need the schematic about now...

AX is held on by a combination of BX, ball return, 1st ball relay, and replay unit (score motor) - This is from my Pioneer manual.

Check the "ball return" switch - is it constantly closed ?

There could be a misadjusted contact on the BX or replay unit... But I can't tell you what contacts are related on the replay unit..

Something is holding the AX ON...