diag
advanced diags
system verification
highlight sysplanar0
enter to select it
f7 to run the diags.

Read the output with care, it can be confusing if you already have errpt entries for a power problem.

If you use diags, task selection, log a repair to sysplanar0 before you begin then the diags in system verification will ignore the errpt entries logged before the repair action was logged and just test the system and let you know if a problem was found.