6027-376 Previous replace command must be completed before starting a new one.

Explanation
The mmrpldisk command failed
because the status of other disks shows that a replace command did
not complete.
User response
Issue the mmlsdisk command
to display disk status. Retry the failed mmrpldisk command
or issue the mmchdisk command to change
the status of the disks that have a status of replacing or replacement.