Corrupt TM in Studio 2021 but not in Studio 2017

I have just upgraded from Studio 2017 to Studio 2021. My version is Trados Studio 2021 SR2 - 16.2.8.9097. I was previously using Studio 2017 SR1 - 14.1.10017.54688. My OS is Windows 10 Home.

I opened a package from a client and attached a TM. When I opened the file to translate, the error message is "The translation memory data file is corrupt". 

I then tried to open the TM in the Translation Memories view, but it gave the error "The TM may contain invalid Translation Units".

I downloaded the SDLTM Repair add-on (which in itself caused a few errors with the Plugins file that I was able to resolve). The Integrity Check on this TM gives the message:

Integrity check started ...

*** in database main ***
Page 170323: btreeInitPage() returns error code 11
Page 170322: btreeInitPage() returns error code 11
Page 170324 is never used


Integrity check completed.

The Repair of this TM gives the message:

Repair started ...

Repair completed.

I then opened Studio 2017 and was able to open and use this same TM without problems.

I located a single forum post concerning the message "returns error code 11" and the implication is that this is a serious error..

This is a very large TM and it would be highly detrimental for me to lose it.

What solutions can I try?

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