I just bought a new 2018 Equinox LT two days ago and have identified concerns. I noticed the vehicle had made a large wet spot underneath the area of the backseat, towards the right side, on the driveway. The next day I noticed the muffler dripping off both ends (not the pipe) and it's pretty rusty where the joints are soldered. (This is a different issue than yesterday.) Does anyone know what these issues are and is a new muffler supposed to be rusty? Thanks.