http://www.nissanhelp.com/Bulletins/Xterra/2005/1.htm
You will find them all above link. Dan is right that is most likely your problem, hold on the WD40 if you get it on anything it's call foreign contamination and will make a lot of stuff squeak up there, it could also get on the pulley's and contaminate the new belt and make it squeak. Most time Just a new belt will work, dealer decides. New belt only cured mine 12K miles ago. Now at 25K MC
You will find them all above link. Dan is right that is most likely your problem, hold on the WD40 if you get it on anything it's call foreign contamination and will make a lot of stuff squeak up there, it could also get on the pulley's and contaminate the new belt and make it squeak. Most time Just a new belt will work, dealer decides. New belt only cured mine 12K miles ago. Now at 25K MC