The last time I opened the plastic cover, the evap was indeed frosted up. What do you mean when you say "the heater ohms".
Right now I have the fridge unplugged as I don't know if there may be any harm to the unit.
And wowers! That's a lot for a circuit board! I would really hope that that's not the problem. Can I check some way to see of it is Indeed the circuit board? Is there Something else that you think might be wrong?