The 'Sharpie' marker is best.
I have used a black marker and just put a "dot" in the visible center of the offending LED. It dramatically cuts the glare, yet allows one to see that it is still on.
If the dot does not quit do it, just make the dot a bit bigger.
A Q-tip with any solvent will wipe the dot right off.
Going inside any equipment is a bad idea if you still have a warranty.
I have used a black marker and just put a "dot" in the visible center of the offending LED. It dramatically cuts the glare, yet allows one to see that it is still on.
If the dot does not quit do it, just make the dot a bit bigger.
A Q-tip with any solvent will wipe the dot right off.
Going inside any equipment is a bad idea if you still have a warranty.