regarding the ice built up in the ice maker is because the fill tube is not properly seated in the ice maker or the ice maker is not level,check and make sure the ice maker is properly installed.
is your appliance less than 1 year?
if so,contact ge for service ,you have 1 year manufacture warranty,because i'm afraid that there is nothing you can do regarding the ice condensation on the back of the freezer and i' m pretty sure is the ice condenser,and only a tech can help with this!!
hope this information help you!!
willian, June 2008