Malfunction: does not boot, does not respond to the reset button.
Failed during operation.

Repair: replacement of the step-down DC/DC converter.

Malfunction: not initializing, no link on the ports.
Failed during operation.

Correction: firmware recovery on the programmer.

Fault: does not boot, there is no link on the ports.
Failed after electric welding.

Repairing: repair of PSE modules, chain restoration Ethernet.