I have a pair of 9396PQ switches where one failed.
I now have the replacement. I installed the matching EPLD and NXOS with BIOS upgrade.
I have 7 FEX that will be dual homed to both vPC members.
This is the first switch I have had to replace in almost 3 years of these things being in operation... so this pretty new to me.
Since I cannot configure the FEX in advance should I just copy the configuration to startup, with FEX configs and power it off... Then power it up after the switch has been cabled.