sounds like an interesting pickle you have here...

I like interesting pickles...

okies... now contray to popular belief it was only KS 1.3 and before that used colour codes, the moment you get to KS2.x+ there are no explcit codes.

this being said... i have an a600 here, (been testing lots of things and obviously enjoying much hackery) now I ONLY get a yellow screen when there is a CHIP RAM failure. i get a GREEN or BLUE screen with a ROM failure. and if the is major grounding going on its a white/dark grey fail..

RED is clearly a problem btw LOL

I will have a look for that paula fix for you and put up a pic with the items to replace...