Update, may have it sorted. Found braid wires connected to a red and a white wire were crossing over each other and touching. Located near middle of playfield. Separated these and F5 hardly gets warm after 15 minutes of game play and being in idle mode. This could be the solution.

Now to staple braid in areas I think might cause problems in the future and some switch adjustments.

Thanks for your help Nino, you kept my head focused in the right direction. Oh also this torch you gave me came in handy. Not so much for lighting but as a stress release while looking for shorts. I pumped that baby like nobody's business. My forearms are bigger than Arnie's now