What do you mean by dual TCC control solenoid circuits? Do you mean the PWM controller?
The second generation of TCC control involved two solenoids. One to apply the solenoid and one to bleed off pressure as the TCC applied. It was an attempt to smooth clutch application.

One thing you might also know is -- I note in TunerPro there is a TCC Feedback bit in the stream. I presume that somehow this signal is part of the code 69 that I am now getting... (TCC Stuck On). Do you have any idea where this feedback signal comes from? Still doing some research on that but thought I'd ask since you are so helpful :)
Unfortunately I do not. Sorry...