This Gauge32 value is the numeric error code from a remote invocation made during the workflow of the FSM that tracks state transitions of that FC SAN border uplink as it comes up or is reconfigured. A non-zero value here tells an admin the FSM's remote call to another UCS component failed, pointing them toward the specific failure code to look up rather than just "it failed." For example, seeing a nonzero code on this field while a firmware or fabric operation is stuck would tell the admin to check the corresponding remote-invocation error rather than assume a purely local fault.