Don,
All of the screws are located on the bottom of the board, and some are recessed a couple inches deep. You need a long, narrow, magnetic, phillips-head screw driver. Make sure when you open the board, you lift it from the front as the cables at the back are short. Also be careful when closing the case, it's easy to pinch some of the ribbon cables if they're not positioned exactly where they came from.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)