For a few months now there has been a whining sound., directly coupled to engine RPM, and independent of clutch gear or speed. At first I thought it was the PS pump, as the fluid was slightly low, but topping it off did not help. It is coming from that general area but it's really hard to pinpoint. I'm guessing it may be PS pump bearing, alternator bearing, water pump bearing or, (perish the thought) timing belt tensioner. Can anyone offer any advise? It like to get it squared away before pending ECU tune.