If it's any consolation, my TZ is doing the EXACT same thing. Was playing fine except for a weak left flipper. I rebuilt the left flipper with power off at all times. Now it is just like the OP's TZ. The split second I touch a left or right flipper button it powers off. All the other solenoids fire in test mode, but if the left or right solenoid powers at all, it resets. I have the daughter card on my counter that I just ordered with fingers crossed.