[NiftySVX]

You could easily check the resistance at connector T2 for the duty A solenoid, If resistance is either 0 or infinite than there is your problem. I think the solenoid winding is around 10 or 20 ohms if I recall correctly. That the only way the computer is going to detect and display that code, it sees an open or short circuit. It does not have the ability to detect a mechanically stuck plunger. Usually, a resistor fault will display a different code than 11 but I'm not saying it isn't the cause, and its easy to check anyway. I've recently been through quite a lot of experimentation with this circuit and it's pretty simple. If someone has been inside your transmission they could have left the ground loose that grounds the solenoid pack, this might cause an intermittent error code. Good luck, you don't want a duty A failure because it can easily take out a brand new transmission in a few hundred miles.