https://www.ibm.com/docs/en/power10?topic=dsalbuosvt-deactivating-indicator-light-by-using-i-operating-system
or, as Rohit said
https://www.ibm.com/docs/en/power10?topic=dlbuh-deactivating-system-attention-led-partition-led-by-using-hmc
or:
https://www.ibm.com/support/pages/how-turn-attention-light-ivm
https://www.ibm.com/docs/en/power10?topic=indicators-turning-off-system-attention-indicator
And for some older systems:
https://www.ibm.com/support/pages/working-system-attention-led-ibm-power-systems
Note: for those of you where English is not your primary language, or where you want the information for other Power servers (ie Power 9), simply change the "en" in the url to your language and you figure out the Power level from the URL. I had to do both on my google results.
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Robert Berendt IBMChampion
Business Systems Analyst, Lead
Dekko
Fort Wayne
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