For a while now I have noticed a resonance from the engine bay at 1,500 rpm, especially when crawling in 1st gear. A couple of mornings the engine has sounds a bit noisy at startup, from outside the car. This morning it was noticeably noisy, sounding like a leak around the manifold area. It sounds fine when driving. Called our dealer who seemed reluctant to believe it was an exhaust noise and to call out Škoda Assist. Planning to do that when we get home, but is there anything common in this