Purpose of white LED lights inside Wolcott amp.


I have a Wolcott P-120S amp.
While rolling some input tubes I have discovered two white LED lights just inside the tube cage at the front of the amp (left & right channel).
One is now on the other is not.
What is the purpose of these lights,
are they indicator or cosmetic lights?
There is no info in the manual.
Many thanks,
GJI
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