My girlfriend's Macbook Pro 2011 13" got damaged by a water spill. Certain keys are not working (e.g. number 8 and 9 and the keys below, U and I) We brought it to a certified company whom told me that a replacement would cost $600. I am not sure which components are damaged as they wouldn't tell me. Would it be possible to buy a top case on ebay and do it myself or is it likely that other damaged parts are causing the keyboard to malfunction? Thanks!