[AmeriLite21]

It's been a while since I have visited this site. Due to weather, work and adding a deck to our home last summer we didn't get to use our 2007 Amerlite 21. The AC ran fine last summer when I checked it out. This spring when I was dewinterizing I turned on the AC and it started vibrating. I got on the roof, removed the cover and looked for anything that may have gotten into the fans. Didn't notice anything unusual. I took off the inside cover and didn't find any thing from below. I was told that it sounds like a bearing gone out, but the AC has only been run for maybe 20 or so days. Doesn't seem like a bearing should go out that soon. Any ideas would be greatly appreciated.