power steering noise (maybe)

[xxxscimitarxxx]

Hi to all

I say ''maybe'' because lm having to try and work this out from 2000 miles away from my car.....son sent me a vid of the prob (which isnt uploading.....grrrrrr)

my 92 seems to sound ''rat at tat tat tat'' when steering is slightly turned either way so my immediate guess was steering pump (part number or is is generic c4?)

it happens at tickover while stationary (lm not driving this anywhere )

has fluids in reservoir so not leaking

then again lm not discounting some other pulley or the water pump but l just cant tell yet and my son hasnt got an experienced ear

opinions would be appreciated......