Testing SM's removed from service

Does anybody have a good method for testing radios that have been removed from service?

We have several PMP-320 Radios and many PMP-100 Radios that have been pulled from customer sites over the years. These radios come from sites, for various reasons: cancellations, poor signal, upgrade to new equipment, Re-Reg, etc. (unfortunately, the reasons were not documented per radio)

I can default the radios, upgrade firmware, and connect to a test AP, but what is the best method to determine if a radio is suitable to be re-deployed into service?

Thanks in advance for any pointers!