Q. When one removes a mezuza to be checked and the puts it back, does he have to make a brocho?
A. Pischei Teshuva (Y.D. 289: 1) quotes Lashon Limudim that debates whether one should recite a brocho when placing back a mezuza that was taken down to be checked.
Poskim disagree on the above question. Many maintain that one should not say a brocho. (K’sav Sofer Y.D. 139, Maharam Shick Y.D. 285, Beis Yitzchok Y.D. 2: 51, and others).
Beis Shearim (Y.D. 370), and others assert that a brocho is needed.
Other Poskim opine that if it is replaced on the same day, no brocho is required. (Shaarei Mezuza 20: 15, Aruch Hashulchan (Y.D. 289: 4), Leket Hilchos Mezuza (4) quoting Horav Vosner and Horav Eliashiv zt”l).
Horav Shlomo Miller’s Shlit’a opinion is that when replaced on a different day, although normally one should reattach the mezuza on the same door frame it was taken from, in this case he should change it to another one, in order to recite a brocho without any doubts.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a