When I start up the car, there an intermittent squeak that lasts for a sec, stops, start, stops... from the engine bay. It goes away after I get up to speed. It's not too loud and imperceivable when you're inside the car. I think it's been going on for a week when I noticed it when I started the car and opened the door. I can hardly hear it with the window down. Could this be the first signs of a tensioner or idler pulley failing? I believe everything is original at 66k miles.