In document on link below is this additional statement which I believe should be part of bug description .
Nexus 5000 and NX-OS Version 5.0(3)N2(1) or Later
See Cisco bug ID CSCtz84683 (continuous GPIO access failure message seen on FEX).
Note: Only FEX power supplies with serial numbers that start with DTN are affected; power supplies with serial numbers that start with LIN are not affected.
https://www.cisco.com/c/en/us/support/docs/switches/nexus-2000-series-fabric-extenders/116122-trouble-fex-00.html
