Are you sure its not just the switch being adjusted too close together? Spread the leaves of it a little farther apart (with game off). The sling fires when the ball hits the rubber pressing them together, I bet yours are just too close and sensitive. Use a small pair of pliers down by the base to spread the trouble one apart a little further, turn game back on, test it out, still doing it, turn game off and spread it out again. The fact that it works in test mode fine makes sense because the test is telling it to fire not the actual ball hitting it. See pic for reference of what the switch looks like.

leafswitch3.jpg

And next time you order something at pinball life pick one of these leaf switch adjustment tools up, they are very handy. http://www.pinballlife.com/index.php?p=product&id=1518

Before you fool with more fuses...

1) Put a piece of light cardboard (a little piece of a food carton for example) in between the contacts for the switch. Does the problem go away?

2) Make sure that the wires on the underside of the switch are not touching (ie: the little blades that the wires are soldered to can get bent)

Well done!

If that chime coil is melted, you better find out why. Chances are there is a bad transistor in the driver board. It sucks to replace a coil just to have it melt again.

Its just easier than using pliers, mostly twisting. the little slot on the end fits so nicely down at the bottom of the leaf switch that only a little turn or twist will open it more or close it. Plus because of its size and angles on either end its useful for switches in tight spots.