okbodymike

I have this 2006 MDX since it was a new. Recently I had some issue with the battery and replaced. and then the Power windows are going crazy that I can not control any windows from driver side window control or by each door control and sunroof is not working at the same time. Sometime all windows and sunroof work together for short time. I went to a dealer for service they said they found the problem and they have to replace one part and it cost $476. Can I fix the problem by myself or I have to go to the dealer? Please,help!