DS 916+ reporting HDD error

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DS 916+ reporting HDD error

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Not sure but I guess this maybe the right place to post my question. My DS 916+ has 4 identical HGST 6T drives (HDN7260ALE610) installed, the first two and the latter two comprising one RAID volume each. DSM started showing a message stating that Disk No.4 has 13 bad sectors at the beginning of this year, which changed to 18 last week. Meanwhile all NAS's were powered off for almost half a year during my stay abroad.
Yesterday I removed Disk4 and Disk3 to have it tested by a renowned HDD testing software called "Victoria", but to my surprise it reported both drives fully functional with no errors whatsoever. Anyone got a nice suggestion about what to do next?
 

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