Bill, these are different than the push locks that i have dealt with, but they are similar. Looking at your pic's on the valve exhaust port at the bottom, and looking at the fittings for the vacuum lines, i believe that they have o-rings in the fitting to make the seal. To release them you should use a small flat blade screw driver and gently pry the lock tabs to disengage the fitting over the tapered part of the valve nipple. That is if you can't get the proper tool for doing this, it has taken my self and other techs a few years to finally find tool for releasing the push locks that i told you about, which won't work on the fittings that you have pictured. I'm sorry i can't give you any more info on this. By the way have you preformed a voltage test to the valve to make sure the controller is working and also did you disconnect the linkage from the valve to the flap, and check the flap operation ?