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50volt power

Hello

Due to an overheat issue in our tech room, the system LED on is now constantly red on our Atlas 550.  We tried to clear the system LED but it won't clear.  Looking at the logs it appears the issue is a power supply 50volt failure.  Even with the failure our 550 seems to operate perfectly fine.  Is it possible to confirm what the 50volt supply is for and what issues can be expected with a failure of the 50 volt supply?  My suspicion is that the 50volt supply is for the POTs cards and because we are not using any POTs lines or cards the 550 we are not seeing any issues due to the failure of the 50 volt supply. 

Thank you

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