Definetly sa problem with the turn coodinator, but it should have disengaged when you pushed the button. I used to just lift the button out when I flew a Mooney, that way it stayed disengaged.(Not recommended for the average pilot, you totally lose the safety feature that way) You might try lifting the button out and see if that will stop it trying to turn.
Next is to take the turn coordinator to a shop and have it checked. Check all the circuit breakers first though.
Luck, Mike the pilot
