Encoder Error LED on AMP-0040

[kwalz]

Does anyone know what causes the "Encoder Error" LED to light on an AMP-0040/AMP-0029? It's on the bottom side of the top board, a SMD LED. Thanks in advance!!

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[TEKMMA]

I have same problem!!! does anyone know about this thread??? I need to know about that mentioned led and HALL ERROR LED on same location, same card....please....