Noisy power steering when cold

[alonroz]

Hi,
Car is a Zenki S14 with an sr20det.
Iv'e recently noticed that once doing a cold start the power steering pump is pretty noisy (similar to what it sounds when its low on fluid),
Reservoir is full and once its warmed up its running smoothly again.
Is it about to fail on me or is there any other known problem with it?

Thanks!