ST2000DM001 Not ready after head swap.

[Continuum]

I carried out a head swap on this drive, and was accessing the drive. I managed to do a backup of the firmware area and then started to copy.
I got to a certain point where the drive stopped, restarted and then spun up. No out of the ordinary noises, but it would not come ready.

I get this in terminal:

Boot 0x40M
Spin Up
RECOV Servo Op=0100 Resp=0005
TCC-0023[0x00026F7C][0x000273E8][0x00027854]
Trans.

Rst 0x40M
MC Internal LPC Process
Spin Up
TCC-0023
MCMainPOR: EXCEPTION: SIM aborted prior to MCMT read
MCMainPOR: EXCEPTION: POR Failed General
MCMainPOR: Feature Disabled... PASS
Starting LBA of RW Request=0000000000087D82 Length=000001A0
ProcessRWError -Read- at LBA 0000000000087E81 Sense Code=43110081

Total AC8, Head AA0, Tail 28 Retry 0 Status 0

Total AC8, Head AA0, Tail 28 Retry 1 Status 0

Total AC8, Head AA0, Tail 28 Retry 2 Status 0
Starting LBA of RW Request=0000000000087E82 Length=000000A0
ProcessRWError -Read- at LBA 0000000000087E83 Sense Code=43110081
Starting LBA of RW Request=0000000000087E82 Length=000000A0
ProcessRWError -Read- at LBA 0000000000087E8D Sense Code=43110081
Starting LBA of RW Request=0000000000087E82 Length=000000A0
ProcessRWError -Read- at LBA 0000000000087E8F Sense Code=43110081
Starting LBA of RW Request=0000000000087E82 Length=000000A0
ProcessRWError -Read- at LBA 0000000000087E90 Sense Code=43110081

Total AC8, Head AA0, Tail 28 Retry 0 Status 0

Total AC8, Head AA0, Tail 28 Retry 1 Status 0

Total AC8, Head AA0, Tail 28 Retry 2 Status 0
Starting LBA of RW Request=0000000000087E92 Length=00000090
ProcessRWError -Read- at LBA 0000000000087E96 Sense Code=43110081

Total AC8, Head AA0, Tail 28 Retry 0 Status 0

Total AC8, Head AA0, Tail 28 Retry 1 Status 0

Total AC8, Head AA0, Tail 28 Retry 2 Status 0
Starting LBA of RW Request=0000000000087E9A Length=00000088
ProcessRWError -Read- at LBA 0000000000087E9B Sense Code=43110081

[repeat a number of times]

Total AC8, Head AA0, Tail 28 Retry 0 Status 0

Total AC8, Head AA0, Tail 28 Retry 1 Status 0

Total AC8, Head AA0, Tail 28 Retry 2 Status 0
Starting LBA of RW Request=0000000000087ED2 Length=00000050
ProcessRWError -Read- at LBA 0000000000087EE0 Sense Code=43110081
Starting LBA of RW Request=0000000000087ED2 Length=00000050
ProcessRWError -Read- at LBA 0000000000087F17 Sense Code=C3160080

Total AC8, Head AA0, Tail 28 Retry 0 Status 0

Total AC8, Head AA0, Tail 28 Retry 1 Status 0

Total AC8, Head AA0, Tail 28 Retry 2 Status 0
Starting LBA of RW Request=0000000000087F1A Length=00000008
ProcessRWError -Read- at LBA 0000000000087F1A Sense Code=43110081

Total AC8, Head AA0, Tail 28 Retry 0 Status 0

Total AC8, Head AA0, Tail 28 Retry 1 Status 0

Total AC8, Head AA0, Tail 28 Retry 2 Status 0
No HOST FIS-ReadyStatusFlags 0002A1A5