What repairs are required for a power steering rack leak?

What is your question?

Brought my car in to the dealer for timing belt replacement and some other work. Was told I had a power steering rack leak - estimated cost of repair $1298.00. Was told didn't need to do it at that time. Would like to know how I can tell I have a problem (I don't notice difference in steering), when I need to fix, and a reasonable cost. Seems all Subaru repairs are a little pricy regardless of at dealer or not.