AgapeList do you mean the log that was created during the migration, or an error that appears when trying to browse the forum?
If migration log, which tool did you use? You would have to report this to the tool/extension creator.
If during browsing, do you mean you cannot find which post is causing problem within a specific discussion? I the discussion opened at the top it should be within the first 20 posts of the discussion as that's the page size behind the infinite scroll. Otherwise you could take a look at the browser console to check which range of post IDs was being loaded.
This could be an extension of its own, you run a command and it tries to parse every post in the database, and tells you which ones are broken. But ideally the import tool should handle this much earlier. If it cannot format a post correctly, the post should be inserted as plain text in the database, or skipped entirely.
