I have had some experience repairing various fails of the duty c system. recently I had a solenoid fail mechanically bleeding off atf failing to lock the clutch packs yet the solenoid ohm tested fine and did not throw a tcu code. this all resulted in front wheel drive only
this video depicts how I use air pressure to open the valve body and make sure pressure is applied to the clutch disks.
https://www.facebook.com/video.php?v=10154906353260372&l=4129290750931752898
there are several writeups on how to get to the tail section but I do plan on doing my own with pawl instructions! the one I did find in USRM the guy had a loose one he HOPED would not lock up on him.... GEEZ X.x