http://www.guardiancases.com/ck010.html

I have 2 of these one is for 76 keys( used it for the Pa2xPro) the other 61 keys I use for my Pa3x-61, can't go wrong with Guardian.

Each case comes with 4 or 6 (don't remember) foam bumpers so that if the Pa3x-76 doesn't fit like a glove the bumpers will make it fit like a glove.