The event related to PHY was disabled can be for empty slot or defective slot. You need to go through details of event ID 274 from below guide to get details and recommendations,
https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c03791995 (page no 41)
After the installation of new drive if the error goes away and you get event ID 275 then this is absolutely fine.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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