Many types of power steering pump has some kind of mesh filter attached to it to filter the oil.
But for making sure your power steering is good to go, loosen up your power steering hose and drain the oil check the plastic if it stuck in the hose or where did it go.
creaking sound is too large to assume.
There is so much possibility of what happens with your car,
But I have this same kind of problem back in 2016.
Possible procedure to narrow it down:
Turn on your engine in neutral position, turn your steering wheel first left and right after that do rev your engine, while you rev turn your steer. If you found creaking ...