Thanks for your advice. It's mechanical problem. The light guiding pipes that suppose to transmits light from LED on a switch mainboard to front panel indicators had been detached from the enclosure (perhaps due to bad shipment handling).
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Thanks for your advice. It's mechanical problem. The light guiding pipes that suppose to transmits light from LED on a switch mainboard to front panel indicators had been detached from the enclosure (perhaps due to bad shipment handling).