Can you take a picture of the copper part you are talking about? There should be no solder joints on the water side of this fridge, or any fridge for that matter. The key for jumping the icemaker out is, while its cycling, test 120volts at the water valve. It will take a minute to get there, while the icemaker is cycling, and when the voltage is supplied, its only for 7 - 10 seconds. If you get voltage there, you know you have a bad water valve. If not, you know you have a bad icemaker. Before you do any of this, look at where the water fills into the icemaker. It could be frozen shut, and if thats the case, replace the water valve.