Don,
There are many reasons why the refrig will not maintain 30 to 40 deg temp. First, read the manual for trouble shooting, if none apply, inadequate venting may be the cause. Mine was not cooling below 40 deg, the fuse for the two cooling fans was blown. You may or not have cooling fans, if not, I would recommend installing fans to increase the air flow over the cooling fins.
Read my post three day ago with the heading "refrigerator not cooling." I had photos attached and explained the fuses.
Forrest