F3 - LED behaviour

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Have noticed a strange phenomenon with the F3 - nothing to worry about. The left channel diode does not light on when switching on the amps. It lights on after several minutes (while the right lights on immediately) and off after an hour. If the amp is switched off before the left LED set itself off, on the contrary of the right one which dims out slowly, it sets itself off immediately. I haven't notice any change in the sound, but what wondering if i shall change le LED or the RESISTOR (or anything else). The F3 is inhabitted by some sprit.... Tks
 
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