Hi Rob,

What game is it - I'm assuming WPC89?

Sounds like an identical problem I had with my Getaway

http://aussiepinball.com/index.php?topic=934.0

Mark has the ULN2803A's on his site no probs.  Not sure about the sockets...Check with them first otherwise Jaycar definately has them.

Does the board have batt damage at all?

I would replace the U18 & U19 as well whilst the board is out....