Method 1
as root, run ‘diag’
then select ‘Task Selection’
then select ‘Identify and Attention Indicators’
then select ‘Set ALL Identify Indicators to NORMAL’ or selectivly as required.
Method 2
usr/lpp/diagnostics/bin/usysfault -t
/usr/lpp/diagnostics/bin/usysfault -s normal
Reference:
http://unix.ittoolbox.com/groups/technical-functional/ibm-aix-l/resetting-warning-light-on-rs6000-2934655