Recently have been hearing a ticking sound in the stove that occurs on a very consistent one beat per second rhythm. No noticeable affect other than the sound. It's not happening during the self-cleaning phase... pretty sure it's happening during the regular burn. Which motor would this involve, and what would be the recommended service? I'm pretty good about shop-vac-ing the parts accessible during normal cleanup (what I can reach via the front door, including heat exchanger). I installed this thing in the Fall and it's been working like a champ. I'm about to open up the sides and see what I can see, but I'm not sure what to do past that. Any help?