Like suggested by Neil, I'd start with a fluid check. And if there is fluid in there, look for metal pieces coming out also.
You may also consider jacking up one front tire at a time, and spin the tires both ways. In theory, if only one wheel is in the air, it shouldn't spin more than about a quarter turn at most.
If you do have to replace it, it's an easy fix as long as you have the hub wrench and a set of 12pt metric sockets to get the caliper off.
My oil line fix
My 100k stopped odometer fix
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.