For the past month, my macbook pro has been having problems when charging. I have to wiggle the magsafe plug to get it to charge. I tried 3 other adapters, same story. I took a look at the port on the laptop itself, and the plastic that covers the 5 contacts on the laptop port has been partially melted. The outer 2 pins are exposed! Has anyone else had this problem before? Is the actual magsafe port even replaceable?