Audi S3 power steering fluid leak HELP

[campbell]

I noticed a leak of power steering fluid under my car a few days after I came back to the car after a few hours.
The plastic engine under tray has a small hole in it so it has dripped through there. It hasn't leaked anymore which is unusual. No warning lights, power steering works fine, no problems what so ever.
I have checked the power steering fluid level, level is fine. The fluid is a dirty brown colour instead of the usual dark red.
Are there any rubber or metal pipes that are prone to failing or leaking with this system?
Cheers

 

[sportstractor]

There is a metal power steering cooling pipe which rust's out. It's at the front on the bottom as is attached to the metal pipes that links the coolers, that's the usual culprit

 

[vrbob]

http://www.audi-sport.net/vb/a3-s3-forum-8l-chassis/148240-power-steering-failure.html

Sounds like the issue i had