Resetting warning light on AIX

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