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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The ice makers use separate valves, so you may have a faulty valve for the lower one. The easiest way to diagnose it is to manually fill the ice maker and if it drops cubes but does not fill back up, the water supply is the issue. As for the auger not working, the most likely to be faulty is a connector from the board or a wire loose. Do you hear the motor humming or buzzing at all or is it totally silent?
Sorry to have wasted your time. My only intention was to help.