My GE side by side ice maker frosts up the dispenser shoot and the ice clumps and freezes together and will not dispense. What do I do before I call a repairman?

The door has an air leak. See what is needed to fix the air leak and you will cure the problem. Here is a manual: https://dl.dropbox.com/u/8010163/GE_Profile_Side_by_Side_refrig.pdf
And one more: https://dl.dropbox.com/u/8010163/GE_Profile_Artica.pdf
You should be able to find the cause and may need a new ice door assembly.