about 6 months ago my friend spilled beer on my mid 09 ubmbp. After it had happened the trackpad stopped working. Someone then told me to use a qutip and rubbing alcohol and try and get it in the cracks. Some how it worked but every so often it would stop so I would use this method again. Now in the past few days my mouse has stopped again. It works for a min or two after I restart then starts to freak out like there is someone moving the mouse. I have tried the rubbing alcholo but its not working anymore. My question is if I were to buy a new top case how hard is it to replace on my own. I would like to bring it in to Apple but they are going to charge me because there will be signs of water damage. I haven't been able to find a good diy online. Anyway thanks for the help.