Do you have SANHQ installed?   If there were any detected errors you would have seen them in the GUI or SANHQ.   I would also suggest upgrading to 5.2.1.    Are you systems on UPS's?     If anything still concerns you, you would have to open a support cases and get the array diags reviewed. 
Our PS6100XS with 5.2.0 firmware lost power briefly yesterday. It was so brief, in fact, that the ESXi 5.0-connected hosts actually just kept right on working (I guess they thought the SAN was just really slow to respond for a minute or two). Everything seems fine (the web UI doesn't report any errors, nothing's rebuilding, etc.) but I'm still nervous. Is there anything I can do to verify that it's healthy?
Very brief power outage - everything seems fine, but...