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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@alexanderbrevig
If I were to place my uneducated guess, they used the LEDs as a rudimentary full systems check. Make a jig with some phototransistors and place it on top, give it power and network cables with known activity on them. If LED blinks in correct pattern everything is working.