Governor Issues

I got this regulator some time back and it has started acting up. I can set a psi but when the keg becomes pressurized the psi on the regulator spikes up and the pop off valve releases the pressure, then it builds again. With my old regulator I could just disassemble and clean the inside. With this thing I don’t see how this is done. Anybody had one of these apart? I only got it because it has an adjustment knob you can change without a screwdriver.

I called NB about the issue and in typical fashion they sending a new regulator. Apparently there aren’t a lot of parts for these things.