That switching power supply only supplies 5 or 12v and that's not enough to run all the solenoids and high voltage devices on the game. Generally used in video games for joystick/button switches and lights only.

In other words, I'm not sure why it's there but the transformer must still be working at least partly or you wouldn't have been able to play it the first few times. Determine what board that fuse is on, then look at the WPC schematic and determine what it controls and work back from there.

I think based on your picture/description the fuse is on the power board and is fuse 112.

Shorted coil can cause F101-F105 and F112 to blow.

Look for a shorted coil, if it is in fact F112, and if it is, everything I'm finding is saying that should be a 7A SB fuse, not a 3A. See if your backbox has a fuse diagram and verify the type and amperage before sticking a higher rating in there, I'm going off fuzzy pictures here.