Here's the relevant page from the FSM. Looks easy. I'd vote to replace.
OEM Part: http://parts.subaru.com/p/Subaru_20...OMPLETE-FRONT-LEFT/60016246/57120AL03A9P.html
OEM Part: http://parts.subaru.com/p/Subaru_20...OMPLETE-FRONT-LEFT/60016246/57120AL03A9P.html