I have 2008 C2S Cab 997.1. I had this random noise appear after I replaced a serpentine belt. Dealership has been trouble shooting the noise for over 15 days. First, they replaced the serpentine belt and saying i've installed a faulty belt. The noise went away temporarily and came back after 3 days. Went back to the dealership and after 13 days they replaced two idler pulleys and claim the noise went away. I came home today and the noise came back. Anyone have this similar noise issue?? Please share your resolution!