Hey guys, i am still having a Music Issue with my DE Simpsons that I posted about a while back

Sporadically, when a Ball starts, the Music for Level 3 (2 Balls Locked for Multiball & Jackpot Opportunity) will play for the Duration of the Ball, even though I'm at Level 1 (No Balls Locked) and should be hearing Level 1's Music.

Someone replied to that specific issue with:

"Check this AFTER the switches are working correctly. Remove each socketed chip from boards (sound chips, PIAs, MPUs, anything socketed. Be sure you know how to safely remove/reinstall chips, observe static precautions. Inspect legs, clean w/ pencil eraser if necessary, reinstall. If still not working right, start at the sound ROM sockets and start checking for open traces and shorts w/ Multimeter"

I'm very much a novice when it comes to machine restoration/shopping, can someone respectfully dumb that down for me?

Thanks!