Hard to tell from your description, is the fluid brown or reddish color in nature?
My guesses are:
1-Oil filter might not be screwed on tight enough or could just be old oil from when your mechanic removed your oil filter that dripped.
2-One of your power steering lines might have a slight pin hole in it.
3-Driver's side engine valve cover might be leaking.
4-Could even be your driver's side strut leaking.
Most likely it's one of the above I mentioned.
If you still can't find the origin of the leak try steam cleaning your entire engine bay as well as the undercarriage (remove the plastic protective piece/pan if you have it) and then see if you locate the area once it leaks again.
Last edited by SharpLS-96; 04-21-04 at 03:43 AM.