Compare the working and non-working file to found ALL differences. Analyse them (there sohould be few differences only, it's easiest to analyze them than large complete file).
Start with unmodified copy of working file then do, step by step, as-small-as-possible modifications within it (e.g. don't change values for two tags in one step). You should discover the exact change that make the file broken
Divide and conqueror method. Start with broken file. Remove bottom half of all tags. If file remain broken, then the problem is in upper half of tags. Repeat the process. If the file become valid, then problem has been in a tag in bottom half. Restart the analysis process, but start with bottom half of tags.
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