ST5000LM000-2AN170 Scratch Pad Restore Failed

[Zero Alpha]

I've got a problematic M11 drive, initially it has this output in the terminal:

Code:

MC051: MainPOR: EXCEPTION: Corrupt PRI copy of MCMT
MC051: MainPOR: EXCEPTION: Corrupt PRI copy of MCMTMS UDE detect during recon   LPCDisc=00 27D2B643 0027
MS Read Fails: 3E95AF00,0000D938
Update Mask - 000000013E95C2D8 - 00000001 - 00
Update Mask - 000000013E95C2D9 - 00000001 - 00
Update Mask - 000000013E95C2DA - 00000001 - 00
Update Mask - 000000013E95C2DB - 00000001 - 00
Update Mask - 000000013E95C2DC - 00000001 - 00
...
LED:0x000000BD FAddr:0x00005E43

And the drive freezes without ATA or terminal access.

After gaining terminal access and backing up system files, the MCMT was reinitialised with C>U10. Also disabled all the usual suspects in SMP.

The drive can now be interacted with via ATA and terminal, but has the following output:

Code:

Boot 0x80MMD45010001   
SpinUp
TCC:001D

Trans
Tech Unlock Handshake: 0xCFE6C19C
Reply:
Rst 0x80MMD4501001   
(P) SATA Reset

RAW OFF
PASSChannel Tracing Offset Value load............................................................................................................................................................................................................................................................................................................
MCMainPOR: Start:
Media Cache Data Base  02463B71D8
Check MCMT Version: Current
Both copy is same!
SP213: Restore: EXCEPTION: Scratch Pad Restore Failed, the MS may contain errors
MCMainPOR: MediaCacheDiscStateFlags 0000002A  MCStateFlags 00020041
6Gb Max Speed lowered to 3Gb for Intel bug
Send Status: COMRESET seen
FIS34

Writing either copy of the MCMT back to the drive (copy 0 has 0x2BC extents, copy 1 has no extents) causes it to freeze without terminal or ATA access again.

Importing the extents from copy 0 of the original MCMT and writing this to disk results in the same error. Verified with C>U4 that the extents are present.

Code:

SP213: Restore: EXCEPTION: Scratch Pad Restore Failed, the MS may contain errors

Anyone resolved this issue before?