Well, reporting missing closing tags is trivial. Just for each type of element, count the number of opening tags, and the number of closing tags. If they are equal, no closing tags are missing (assuming no openings tags are missing). Else, the difference is the number of closing tags missing.
As for repairing -- without a DTD, it's going to be heuristics. And I'm not going to suggest any heuristics based on a tiny sample (643 bytes out of 80 Mb, about 0.00077%) of the file.
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