I have looked real close at your fridge pertaining to your problem. So I do apologies for taking me a little longer. Since this appliance was stored without being treated and drained, basically this system has now been contaminated. You are better off, replacing the entire system because in cleaning it, you will not be able to get to all the spots where bacteria likes to grow.
Even if you would use a diluted bleach cleaning, it will not remove all of the mold from inside this ice unit. Secondly, the remaining mold that is in there will either break off at some point and get mixed into the ice, or it will set as a base for new mold to start growing again. On top of that, you will never get the taste out of the system. Either way it will create a health problem you don't want.
As for retaining parts, you can get them at any appliance dealer that sells LG products. There are a number of on line appliance part disturbers that can assist you and also sell these parts you need at a cheaper cost. Once you have replaced the entire water system you will have better tasting results. When it comes to storing again it is better that you disassemble the ice maker and drain the entire unit. If you like, you can go to you tube and there are a number of helpful videos to view. If you need additional help, please let me know and I can work with you. I wish you the best.
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