Word that means "in the process of being repaired"?

Question

Is the correct word repairing? Example sentence:

He hauled his iPad from inside his desk, a temporary replacement for his __ iPhone, and held it before my eyes. "Check this out."

Answer 1

There is not a word that can be used for this. you could say it a few different ways though.

1. A temporary replacement for his broken iPhone.
2. A temporary replacement until his iPhone is fixed.
3. A temporary replacement for his iPhone

Answer 2

The bridge is under repair.

The elevator is under repair.

But to say that about a phone sounds weird: (My iPhone is under repair.)