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Those codes indicate a problem with shift solenoid D. I don't know what a shift modulator is, and I think I know all the parts that go into a TorqShift transmission.
Usually this can be repaired by changing the bad solenoid and replacing the fluid. It's not that hard to change a solenoid, it is inside the pan.
On one side of the solenoid body there are four solenoids. The other side has three. You want solenoid D, which is the center solenoid in the side that has three solenoids.
I've never purchased a solenoid, I just took them from a parts bin when I needed one. There was no cost to me. ;-)
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