zalman zm700-lx

Hi guys! I have a question regarding PSU fan replacement; I have a ZALMAN ZM700-LX PSU (http://www.zalman.com/contents/products/view.html?no=83 ) , just over 3 years old. Few days ago PSU started making a loud noise, so after opening it i figured it was a fan. I cleaned the PSU and lubed up...