i'm pasting this from youtube, apologies for the brevity:
this is probably the most informative keyboard tutorial, but i've got a few questions. those liquid sensors you pointed out, am I right in assuming they turn red when wet? i discovered that one out of three of them was actually red so I assume they would have spotted it. More importantly, when you showed where you jumped your board, I noticed my unibody macbook (not pro) is a little different, its a 5.1 (late 2008/2009), would any ebay'd kit work? and do they come with new sensors/replacement black cover?