OK done some research for you, the replacement that you put in must be an L.
At least I've learnt something 
OK, the IRL540's went in today in aux board (thanks for quick delivery MarkC)...The powerboard went back in with all new fuse clips, all back together. No fuses blowing on powerup...Magnets now coming on in diagnostics...ripper initially not working, replaced coil with spare and now 100% working.
Thanks again for your expert advise and I can now put 3 x minor board repairs under my belt.
Machine is now 100% playable and I got to say what an awesome game. When those magnets kick in they are simply CRAZY!! The ripper is fantastic too. Wicked game..
Will have to try to source a replacement bottom assembly for crane as I am 99% sure it must be missing gear teeth as it has lost about 10% of its 180deg travel. I think this was an existing issue with the op putting some rubber on one end to make contact with switch.
Thanks again guys! Much appreciated.
