Where did you get a 326 board? Seems like they stopped making them a long time ago and they haven't been available for a few years.
I've put a few in customer's games and have had good luck. Even put one in a BK, which later versions had sound issues with. I've used lots of RD boards over the years and have only had a couple minor issues. That 326 board is likely the most loaded board they ever made. Lots and lots of components.