But since it's the encrypted seed that may be affected, Electrum can't detect if it's corrupted.
Anyways, if you try the post above and it resulted with something like:
............\x02E\xff\xc9\x90\x08\xb5\xac\xdb\xca\x8e\xb1He\xb1He9b6b4?\xfd13320ead,.............
Recovering a corrupted file is a job for data professionals and out of my scope, sry.