PE6800 consistant same slot hard drive failure

I have a customer with a Dell PowerEdge 6800 whose experiencing back-to-back-to-back hard drive faults (either failure or predictive failure) in one particular SCSI slot - Slot3. RAID5 configuration.  
After the initial failure the drive was replaced - rebuild failed.
2nd drive replacement - predictive failure.  I then had the admin take the drive offline.
3rd drive replacement - rebuild failed.
All drives are refurbs and 1:0 - 1:3 are the same DP/N Y4707 - Seagate (ST3146854LC) drives.
The customer requests that we try DP/N FC958 - Fujitsu (MAX3147NC) drives, the same drives as in 1:4 - 1:11.
I'm thinking backplane or storage controller as the culprit.
Any thoughts?
PhillyGeeAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
can you put a replacement drive in another slot or are they all being used?
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PhillyGeeAuthor Commented:
They  being used.
A colleague suggested the customer has a batch of bad spare drives that were used for replacement.
I attached an Excel file of the ESM and System event logs that he looked at to determine this.
CEI---SC-1000038790.xlsx
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pgm554Commented:
I've had Dell hot swap backplanes go bad several times in the past,so you're on the right track.
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PhillyGeeAuthor Commented:
Batch of bad drives.  Finally got one to work.
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PhillyGeeAuthor Commented:
Persistance.
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