How to disassemble Satellite P850-321 notebook?

Can anyone explain to me how to remove the keyboard please, i have removed all but 3 screws on the underside of the laptop as the 3 remaining screws dont seem to want to come out!? I can tighten them but unscrewing them seems to be the problem... are they screws that undo but dont come out like the back plate covering?
I have removed all the hardware such as HDD, RAM, wireless card and ODD.
I need to get to the FAN as that needs replacing.
Cheers
Alan.

Hi thanks for your reply...
yeah i know it would void the warranty, however it is out of warranty anyway, i am a Computer technitian. i managed to get the keyboard out this morning.
do you have any ideas why the laptop comes up with the warning message to get a service because of overheating?
i have cleared a very small amount of dust from the fan. i have removed and reseated the fan and since then, the message has not come up. i ran tons of applications to try and get the message to come up again to no avail which to my understanding and diagnosis the issue is fixed.
however, since this is a customers laptop i want to make sure the problem is fixed.
there seems to be a huge number of people with the same problem when they get a warning message and is a fault of toshiba and something to do with "value added packages/applications" software.
i couldn't find this software at all and the laptop itself is very clean.
thank you for your help.
Alan (Computer Technician)

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