What is happening in the game when the fuse blows? This is the important part for figuring out why the fuse keeps blowing.

I had the same issue with the solenoid fuse on my Alien Poker because a diode on the drop target bank was bad and was causing the bank to try to reset repeatedly.

Yes the coils were all fine. The problem was caused by the drop target bank resetting in between balls. Basically the bad diode made the game think that the targets weren't reset when they actually were, causing it to fire the drop target reset coils over and over until the fuse blew or I turned off the game.

I think it is telling that your fuse is blowing in attract mode when presumably none of your solenoid coils should be activating. To me this indicates a probable board problem. During attract mode the only solenoid related thing happening is the sound select inputs being used. I would check the solenoid/sound select PIA on the driver board, perhaps there is a short or an issue with that PIA.

You can start testing this PIA by going into the solenoid test.

If it's not a board problem I would be checking pop bumper leaf switches to make sure they're not stuck closed.

Try to isolate what is happening when the fuse blows and that will lead you to where the problem is.