If the sefer torah is disqualified at the end of the reading

Hi,

As a general rule, if a disqualification is found in a sefer torah during the Torah reading, one continues the reading with a new sefer torah, but one does not go back to that which has already been read.

If the disqualification is found after the entire reading is completed, one does not go back. Some authorities suggest that the congregation may take out a new Torah and read without blessings, but others disagree due to concern for the honour of the Torah scroll.

(Rivivot Ephraim 1:210)

Have a great day,
Mordechai

A mistake in a Torah scroll

Hi,

If a Torah scroll contains a word which is written incorrectly, that Torah may not be used for the public kriat hatorah. This is true even where the textual change does not alter the meaning.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 5:20:27)

חג אורים שמח,
Mordechai

Housing a pasul [disqualified] Torah

Hi,

A disqualified Torah may be kept in the Aron Kodesh [Ark] in the synagogue.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:38)

Have a great day,
Mordechai