Hello, I own a 2003 Subaru Forrester with 76,000 miles bought it with 68,000.  After a year of driving it started to develop a whine towards the front passenger side.  At first I thought it was the brakes.  Boy was I wrong.  I checked the front diff. fluid. and it was at the proper levels but there were some fine metal flakes in the fluid and on the drain plug.  I took it to the mechanic and he informed me that the front transaxle(front differetial) needed to be replaced.  A $2000 dollar repair job or more.  He mentioned that it was rare for a subaru with such low mileage to have such a huge problem but I guess thats the luck of the draw.   
     Time for me to fix my car and sell it!  Too bad I was hoping to own a subaru for a long time.  Hope this info helps those with similar problems.