I have a 2002 Sports M/T. After how many miles should I change the drive belts? I read some posts on this forum saying the passenger side wheel well cover needs to be removed during belt change. Is that necessary? It seems like I can access everything from top. Also I should loosen the adjusting lock bolts first before the adjusting bolts. Is that correct? Are the only 4 bolts (see attached pic) I need to loosen in order to change the belts?