أَوْ تَكْبِيرَاتِ الْعِيدَيْنِ، أَوْ جَهَرَ الْإِمَامُ فِيمَا يُخَافَتُ، أَوْ خَافَتَ فِيمَا يُجْهَرُ.
Translation: Or omits the extra Eid takbirs, or the imam recites aloud where he should recite quietly, or quietly where he should recite aloud.
The extra Eid takbirs are binding in Hanafi prayer; accidental omission falls among causes of prostration. Likewise, when an imam mistakenly reverses the prescribed audible or quiet recitation, compensation is required.
This specifically concerns the imam; a person praying alone has different rules in some prayers.