Yes, there is not much room for the PSU I have another thread I am going to start with a PSU install guide but it is very tight in there and that one bolt is impossible to put back in without magic fingers.

OK NEW PROBLEM:

Avalon firmware v. 3.21 stops hashing but thinks the miner is still alive.  Can still log into tp-link.
Hard reboot with power cycle gets it going again.  This happened to two of my miners last night had to hard reboot them in the morning.  Soft restart of cgminer also works.

so basically this problem already discussed here: https://bitcointalk.org/index.php?topic=159827.0

As a temporary solution until next stable firmware update, does anyone have a monitoring script that periodically checks the hashrate and restarts cgminer when it dips below certain threshold?