pwu

I have a sub 10 power board that's stopped working. After careful visual inspection I didn't find any burned components. Following your initial voltage testing procedure it has the 97V on the big cap, the 25V across the two 15V voltage regulators' tabs, the +-15V are present, but I didn't get the ~5V across the two 150-ohm resistors. What's that telling me? Where to check next? Thank, Peter