Thank you all for sharing your knowledge.
After reading your posts, and discussing with some local plumbers, appliance specialists, and water company, I am confident with knowing that the stuff is copper sluff. I will replace the copper tube with potable plastic tubing.
One more thing I would like to run by you all.
After thoroughly thawing, drying, and cleaning the entire Fridge/Freezer unit, and reassembling I am back to my original problem, (which I hadn't detailed above): the water continuously flows from the ice maker. In other words, after reassembling I plugged the fridge/freezer back into power and the water supply continues to flow into, and then overflow out of the ice maker.
Because [A] the water supply pressure is strong, [B] the continuity of the (newly replaced) water inlet valve is good, I assume I simply have a bad ice maker. Do you folks agree?
2 questions:
How does the water inlet valve know when the ice maker is full of water, and to close the valve?
Does anyone know where I can acquire an Ice Maker cheaper than $112, for Amana SRD20S4W?
I did find a replacement ice maker for $35 but Im waiting to hear back from them. The price makes me a little suspect when compared to other prices I have seen. Thank you all for sharing your knowledge.
http://www.seneca-river-trading.com/reicbforwhse.html
Thanks gang!