ה֣וּא בַשָּׁנָה֩ הָרִאשׁוֹנָ֨ה לְמָלְכ֜וֹ בַּחֹ֣דֶשׁ הָרִאשׁ֗וֹן פָּתַ֛ח אֶת־דַּלְת֥וֹת בֵּית־יְהוָ֖ה וַֽיְחַזְּקֵֽם׃
He in the first year of his reign, in the first month, opened the doors of the house of the LORD, and repaired them.
Rashi on II Chronicles
and reinforced them because Ahaz had destroyed all the vessels of the House of God.