I have a 6 month old Amana side by side and the freezer was forming icicles at the top inside. The service rep put a small amount of RTV silicone where I guess the seal was leaking. I think they have a problem with the door seals. If its in warranty, have the Amana rep come out and do what he did with mine. If not in warranty, they may still come out and fix for free, but you had better ask up front.
If you wish to try it yourself, try to isolate where the air leak is, smear a small amount of RTV silicon at that spot, apply tape over the smear and let sit for 24 hours, remove tape and trim excess. However, if you don't know what your doing, you make make things worse not better.