Thanks heaps for the replys.

Tested the resistors out of circuit and they are spot one - great advice thanks retropin.

Firepower - that would be great if you could send me the 'logic diagram' (PM me if you want my direct email address if thats easier) - bought a logic probe today, so will search some tutorials on how to use this beast.  Unfortunately Jaycar didn't have the right molex connectors for the interboard, so will get some during the week and fix that first before powering it up to use the logic probe.