judremy, this might have been the culprit to your blown fuse. I've been chasing an intermittent high resistence reading to ground on the upper playfield GI circuit. I believe I've found the culprit, the fix was easy, but the location of this socket boggles my mind. There should have been a service bulletin for this. Put a piece of tape on the backside of the socket that might come in contact with the left side rail.