I went ahead and replaced the PS pump, pressure line, and all return lines because of a leak on my 87 Turbo (and the fact that everything was 21 years old). Now the pump is noisy (like a low fluid groaning sound) upon startup. It lasts for a few minutes, and then goes away.
Is there a filter in the PS reservoir? I DID NOT flush the system, nor did I really clean out the reservoir (dumb). It seems that the fluid is restricted on it's way to the pump until it heats up a bit. There has to be some sort of screen/filter built in to the reservoir, right? Suggestions?