Sorry to hear about your trouble- hope its an easy fix. I've yet to replace the solenoids. The transmission does seem to shift into 4th more consistently now, but the RPM is still high. I will be sure to post any further troubleshooting steps whether the outcome is good, bad, or unchanged.
Update: Since completing the transmission flush I have changed the transfer case gear oil. Although the old oil resembled "butterscotch" accoring to a parts store rep who disposed of the gunk, the drain plug magnet revealed not more than two or three pieces of shavings no bigger than 1/64" or so...
I believe the ECM was successfully commanded the valve to turn. I think this is a strong indicator that the TP Sensor is still good. Tech said he would still have to "test the solenoid valve". Hopefully that is the fix. Meanwhile, I google image search healthy transmission guts.
Thank You much for your help so far, hope to return the favor some day. Still no resolution and I'm hoping for more insight. I flushed the transmission at a Valvoline shop and upon doing so, the outgoing fluid appeared still a clean color and exhibited no bad smell, but still to no avail...