I have a 3406E 2WS motor, on one cold morning bobtailing going downhill, my jake brake switch was on and engaged. I heard a loud pop noice and after that my number 3 switch and one stopped working. It pulls great but recently I hear hissing sound from the # 6 cylinder. My question is, if you engage the jake when it is cold, can it cause any damage to the valve or head. Thanks.