I have at same time funny and serious problem with Extreme x650 switch.
During the cleaning / "dust extraction" procedure with a compressed air one of our jumpers fell of from the inside of the x650 switch. The problem is that we lost connectivity on our serial/console port !!!
We don't have the internal schematics of the X650 switch so we don't know where to replace the jumper in order to restore the connectivity to the console port.
The switch is now in production and is preforming without any problem. Unfortunately it is time for the firmware upgrade and we have serious concerns that we might "brick" the switch if we don't have the means of access it other then the NMS VLAN and management port.
Please help !!!