Lost Bubble

I've tried numerous searches through 4b, 8b, double, and float to find the value of remaining bubbles. I'm on level 2254 and there's one single board (1956) that I cannot get three keys on and it's driving me nuts. I've spent thousands on gold, and I've used gems, and I can only get two frelling keys...

Thanks!

game link: https://apps.facebook.com/lost-bubble