Just fixing parshat tsav in at Torah and noticed this error. I think what has happened is that the join between yud and nun sofit shapes faded badly (though it is still there and still solid but very thin) and then a subsequent (and it appears careless) scribe who was inking over thinking it was a yud has added a regel to the yud creating a safek over the tsura of the ot. It looks like a yud and nun but is actually a tsadi sofit. Or is it?
It should read chamets (see tikkun). Now can one merely thicken the existing
join between the letters and then scrape the regel of the yud or is that chok tochot?
The simplest non doubt way would be to erase the whole yud and rewrite as a tsadi sofit.
However what if this had been in tefillin or mezuzah where shelo k'sidran correction
would not be permitted - could one reinforce the existing join and scrape the regel?
What do people think?