2004 e53 m54 3.0l

On one cold morning, started the truck and heard this weird noise.
Seems like the power steering pump. Then I checked the PS reservoir , I'm a bit low on fluid, so I topped it off with redline ATF / started the truck again / turned the wheels max left and right. And the weird noise was gone !


As a precaution I will replace the PS return/suction hose and clamps, bleed the PS system.


Anything else?6