Thanks for getting back to me. Luckily, I no longer need your help! Information on Intel forums indicated that the problem was most likely with the memory, and
I opened the chassis up and discovered that I hadn't pressed the memory sticks into the slots hard enough when I assembled the computer. The beep-and-blink pattern did conform with what's associated with a memory error in the chart you posted above, if I recall correctly. The NUC is working like a charm now -- I'm very pleased so far. You may mark this ticket closed.
I am glad to hear that you encountered and fixed the issue you were having with this unit.
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