Matt,
We have two 450i's that died in the last two cold snaps as well. One is completly inaccessable until spring but the other can be reached with a climb to replace it. For now we have not replaced it since we were able to get customers converted to other platforms or onto other APs. How should I go about opening tickets on these without having the APs in hand.
Also it is possible these both were bought in the same batch of APs. Others in our network are just fine at this point. Obviously we get a lot of cold weather up here and we have had 450i in the network for over 4 years. Both the failed units were new last spring.