Quoted from Neal_W:
I assume that LED is driven by a nearby node board which is letting too much voltage leak through in the off state. Adding some extra resistance in series with the LED should correct the issue, such as 100ohm resistor added to the wire going to that specific LED.
There are some spike2 node board discussion and repair threads, you could ask there for a second opinion and more details.
(the Morse Code on my premium is normal)
I wonder if this issue was addressed in a node board firmware update. For you guys who are seeing this issue, are you running the latest code?