Power steering, rac n pinion

Hello all my name is: mike
I have a: base
Ive been having a power steering fluid leak and while I was having other work done my mechanic said I need to replace rac. Yesterday I must have over filled the reservoir and this morning was an awful smell and fluid on the driveway. How bad is this do you think? Oh and will the smell eventually go away in the cars cabin. Sorry for being ignorant of the issue but maybe someone has this issue.;

The rac is leaking or the pump ? Rac can be refurbished but not the easiest job to take it out !

I am unsure but my mechanic said it was the rac. Quoted $800 I am unsure if that is correct