Almost agree with the above post, especially how the lower step looks.
But you can chisel away the loose part, use chemical anchors for reinforcement, and cast new parts.
Sand off all the paint, and use rep 955 on the stairs.
And some plastering on the back.
It will be much cheaper than removing the old and casting a new one.
However, a new one will be nicer, of course.
Alternatively, remove it and replace it with a new one in wood.