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If the RTM is properly installed, the leftmost LED should be OFF, not BLUE.  NOTE: Because the RTM is actually a bit shorter than it should be, you need to also deliberately press hard on the right side of the RTM (near the green LED) until you hear a CLICK. This needs to be done every time you remove either the RTM or the front panel. You cannot rely on the lights on the RTM/front panel to indicate whether this has been done properly.

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