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Maybe i can shed a little light on how the tc lockup function works. Imagine a tube with a piston in the middle, on the left side you have transmission modulator pressure (throttle input) and on the right you have govenor pressure (speed input). When you are into the throttle on acceleration...

I rebuilt Alison "Legacy" trannys (I.e. AT,MT & CT). That tube is just a drain tube for the rear housing. Not a big deal if its broke unless you have pieces floating around in the rear housing.

Finally! After all this time gaining loads of usefull info i can finnaly contribute! That screen as there as a saftey measure to ensure govenor operation. It is not uncommon to find a very small black/grey particles in there after many miles of operation. Of the hundred or so of these i have...