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I am familiar with TDS7104, I don't know if TDS8000 is similar and if any of the following is true for TDS8000:
- NVRAM is not on a socket. On TDS7104 you can dump its contents to a file using vxWorks. I think the code is somewhere on EEVblog for a different family of TDS scopes but works on TDS7000
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nvrBase=<address of NVRAM> (I think this was ~ 0xfd0c000 on TDS7000, not sure though)
nvrSize=<size of NVRAM> (was 0x2000 on TDS7000)
tempBuf=malloc(nvrSize)
memcpy(tempBuf,nvrBase,nvrSize)
fdescriptor=open("dbfs:c:/vxBoot/nvrdump.bin",0x0202,0777)
bytesWritten=write(fdescriptor,tempBuf,nvrSize)
close(fdescriptor)
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Factory calibration data is stored on a separate X24165 EEPROM on TDS7104. I was able to dump it to a file using vxWorks:
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Allocate tempBuf as above with malloc, at least size of 0x800
nvMem_read(0,tempBuf,0x800)
fdescriptor=open("dbfs:c:/vxBoot/eepromdump.bin",0x0202,0777)
bytesWritten=write(fdescriptor,tempBuf,0x800)
close(fdescriptor)
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nvMem_read reads the X24165, not the battery backed Dallas RAM.

In case it is not common knowledge vxWorks command line works with "vi" commands, delete key didn't work for typos on TDS7104 (and the terminal emulator I used) until I realized I could use vi commands.

ghidra does a good job of disassembling object files in the hard disk.

I connected HD to an USB<->IDE connector and
1) Copied hard disk with cp -a (on a unix like system)
2) Dumped HD binary with "dd"
My unit works with Windows98. Luckily I had a Windows98 OS CD.

CPLD going bad is a remote case, there may be more danger of damaging it while trying to read.

There is a command to set BIOS to initial state in the hard disk. Saving BIOS may not be needed.

On TDS7104 there is a case open detector. I don't know if it was my unit or all units but If it sees light it burns enough current to discharge the small BIOS coin cell battery in a couple of weeks.
Ozan