@Freemind/clawrence:
If there's a genuine mismatch in air flow, then there's no way to clear the alarm.
However if you have managed to tamper and reversed the polarity then the alarm might clear. If there is no mismatch physically and yet you see this alarm, please try the following command:
set chassis alarm management-ethernet link-down ignore
There was a cosmetic glitch in some cases that causes the management link down to be read as an airflow mismatch alarm PR1327561 (resolved on 17.2).
Note that physically modifying the PSU isn't recommended and replacing it with the right part is best; especially if you may need an RMA some day.
-r.
--------------------------------------------------
If this solves your problem, please mark this post as "Accepted Solution."
Kudos are always appreciated 
.