Help Diagnosing Multiple Drive Errors - Looking for fresh perspective

Long time lurker now reaching out for help.

A few weeks ago I had one of my drives (drive 9) throw an error that took it offline. Unraid put it in emulated state. After running 3 preclear cycles on the drive, it passed. I then rebuilt the array back onto the flagged for failure drive.

Since that time, I started digging into the logs curious for why I had the failure (something else caused the error?)

Attached is system log of when I first had the failure (dated 8/25). I do have a full diagnostic on 8/25 but it is not "anonimized"

Here (in the earlier system log) you will see that

Disk 9 failed and disabled

Disk 10 had interface problems (ATA bus errors - maybe bad cable?)

I have had various CRC and Raw Read errors on numerous drives - although please note some CRC errors had occurred long in the past.

Since then I have

Run xfs file checks on all drives while in maintenance mode

Run full extended smart checks on all disks (they all pass)

Reseated SATA cables

Replaced the Cables connected to the ASM1061 (Disk 5 and Disk 10)

Replaced the Power Supply ( I had a 3-Rail 12Volt Power Supply, replaced with Single Rail - EVGA 550G3)

Placed a fan on the LSI 9207-8i (I discovered it was running hot at 78 degrees C) [Disks 6,7,8,9,11,12,13,14 connected here]

***TODAY***

If I run a correcting parity sync - Unraid still informs me of a few dozen sync errors

If I then run another non-correcting parity sync immediately after, Unraid is still complaining of sync errors

At this point I am now trying to determine if drives may be failing. I have multiple drives with Raw Read errors, but NONE have uncorrectable, reallocated, or pending sectors.

Hard drives are kinda expensive right now........ but Drive 8 and 9 seem to be increasing Raw Read errors (but nothing else)

I started using Unraid Mover to clear Drive 8 to possibly remove from the array, maybe replace. During this operation, the log AGAIN complains of another "interface fatal error" I believe this was a link error on Drive 10 again if I am reading the log correctly.

Main Question - what is causing the ongoing sync errors?

Drive 8 or/and Drive 9 Raw Read Errors

Drive 10 IO Error (cable has been replaced)

Something Else?

Would someone please help me look into my woes with fresh (and more experience) eyes. I seem to be running in circles and may possibly be having simultaneous problems. I have also attached a current diagnostics file.

I appreciate your time....

syslog - 2026-08-25.txt towerbackup-diagnostics-20260901-2158.zip