As Jason says, you can't set the level of the fronts separately. There is a balance control which I'm not sure is on the remote but is definitely on the front panel. Make sure this is balanced first, then set the level of the rest.

A few weeks ago I was having the same problem with a 1 1/2 year old 1050 which had been level set many times. It took a while to realize that the kids had played with the balance and left the right channel at +8.