I can't give specifics as they aren't even known to me

If you don't know what the errors are, how will you tell whether the other DB works correctly or not?

I betcha 20 to 1 that the database does what it's supposed to do, just as it has for the last 20 years. The problem is in your understanding of what it does, how it works, or how to invoke it. So replacign one functioning DB with a different functioning DB won't get you any further.

Figure out what you want it to do, figure out how to do it manually, one step at a time, and then automate.

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