On Saturday, 30 May 2020 21:35:38 UTC+1, alan_m wrote:

Don't worry about it
Neon do flicker and possibly more at the end of their life.
Even if the neon completely fails and the red light goes out the socket
will still work as normal.

A warning light that does not work should always be replaced, covered, or marked as broken, since is necessary to have a warning that the warning light cannot give a warning.

--
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