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If you unplug this and plug it back in to you hear a slight click coming from the CCU near the top right side of the machine or towards the back top?
right. no lights at all on the user interface.
yes, i've opened the top cover. i see the gray cable running from the CCU to the top front of the machine. I cannot see where it connects to the user interface. connection to the CCU appears to be secure. wiggling the cable and gently pulling on it had no effect.