2000 LSi blowing a fuse

My 2000 Metro (1.3L) started blowing a fuse recently. The 15 amp fuse controls turn signals and also will not allow the auto transmission to be moved from park. The local chevy dealer said to replace the fuse block at a cost of around $300. I think it is just a bare wire or short but don't know how best to repair it. What would you suggest..replace the fuse block, take the car to an auto electrical specialty store, or what?

See this thread (http://www.automotiveforums.com/vbulletin/showthread.php?t=300068&highlight=park)