switched on dr who after it has been stood for about 6 months and was greeted with the factory reset . Batteries are mounted off the board and was using lithium batteries ,so I have no battery leakage. So installed new batteries and setting etc and started play game for a test and that’s when I noticed the expander not working , so put it in test and it still didn’t work . I disconnect the motor,which was nice an easy as it is connected with scotch block , so I then lashed up 12v to the motor to see if it moves and yes it does . The gearbox and motor are working perfectly. Looking at the Bi directional board on the machine and J2-1 and pin 4 are both reading 20v with the game switched on , that can’t be right ? .Tip 107s and 102s read ok ,so now i am a bit stumped !