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Toshiba Satellite Radius P55W keyboard is attached to the top case. In order to replace Toshiba Satellite Radius P55W keyboard it's necessary to remove the motherboard. Here's complete Toshiba Satellite P55W disassembly guide.
Take a look at the step 7 in this tutorial. http://www.dannydullin.com/mbp-13-inch-2009-or-2010-stopped-booting/ This is a rubber spacer. You have to place it on the hard drive bracket. This will separate the bottom cover from the cable and prevent another damage.
In cases like that I open up a laptop for the motherboard inspection. Look very closely for ANY corrosion. Clean it up using a toothbrush and alcohol. Even a very minor corrosion has to be removed. Here's a guide for Mac laptop liquid spill diagnostics.
I would take a look at the motherboard. Probably some liquid got on the motherboard and because of that it's not working properly. When I troubleshoot a laptop after liquid spill, I always remove the motherboard. Even minor corrosion as it shown on the following picture might cause big problems. Here are steps for troubleshooting a Mac laptop after liquid spill.
If the screen is cracked, you cannot repair it. The screen has to be replaced and it's easy to do. All you have to do, is remove the screen bezel and disconnect the screen. The following guide explains how to fix broken hinges but you can use it for replacing the screen too. http://www.insidemylaptop.com/replace-broken-display-hinge-in-acer-extensa-4620z-laptop/
Yes, you can replace just the keyboard. You can use this guide as an example: Replacing keyboard on MacBook Pro 15" (Mid 2010) The guide is for a different model but should be very similar.