Hi D. Buettner,
The "Address test verification failure" error is pointing to DIMM issue.
In-depth cache diagnostics are run only at power on of a controller. Normal runtime diagnostics will determine if parity errors are affecting data and lead to controller termination in advance of data inconsistency. That is why you see such a controller failure upon power on.
I would suggest that you reseat the controller DIMM and check the status. If the issue persists, replace the DIMM with spare and boot the controller.