Adam this may not be the problem but my space invaders kept blowing the same fuse. It was a bulb socket. I removed all the globes and then tested. First I put back half the insert ones and nothing blew. In the end it was a gi one. Don't know if it was an actual holder or a globe. I just left the holders I thought were dodgey empty until I did my pf swap. Never had a problem prior or after the swap.