The memory is failing at the last test. When we sent it off to you, it was all passing. Can you check the RAS line on the Strongarm and see if it has come loose? Other than that, it is also possible that flex from installing the mainboard in the chassis could have caused a solder joint somewhere to come loose. It's hard to tell on this end as we only had the mainboard.

Let us know what you find,
Stu