[c-nsp] heat fins popping loose on WS-X67xx cards

[Kevin Graham]

> The first shows the "Z1" socket in the background with the fuzzy loop in the 

> foreground. The second shows the heat fin & loop in the foregraound with the 
> socket in the background.  The loop is supposed to be in the Z1 socket.

Just unpacked a WS-X6748-GE-TX and found a loose jumped in the bag. Thanks to
this thread, gave a slight push to the heat fin and off it came, with jumper
Z1 suspiciously absent.

> Based on the responses I've received it seems that this is a fairly common 
> failure due to a design flaw.  I got the usual "that's strange; nobody else is 
> having this problem" from Cisco.  I now have ample justification for telling 
> them "bull".

Indeed. Given the number of instances cited here alone, I'm really surprised
there hasn't been a field notice.