Hi All,
I have a stack made up of:
1 x 24p Nortel 5200 (BASE)
4 x 48p Nortel 5200
The AC in our server room failed and the stack was exposed to temperatures of around 40C for the weekend.

Going by the spec sheet the top operating temp for the 5520 is 40C and come Monday morning all LAN connections were down.
Does anyone have any experience of this happening? Are the switches likely to be fried?
The units power up and look normal (power and link lights, etc) but no connections and can't access them via telnet/SSH.
Have tried the UI Button reset and default IP reset methods but the unit(s) does not pick up 192.168.192.168 as it default IP.
A recycled 5520 unit from Ebay responds fine to the UI button IP reset (3 seconds, 5 presses, 3 seconds).
Thanks in advance!