Hacking switching hardware stuff

[lil-devil]

im just wondering has anyone tried, to switch stuffs on the motherboard it self and be successful?

cause i have 2 ds, both have different problems
1st ds
the L key doesn't work at all
The R key only works after blowing it, and it's still not working the best

2nd ds
the power switch key tab is broken off

so what i wana do is switch the power key tab but not sure if its possible
or if you know how to fix the l and r key please enlighten me please and thank you ^^

Edit:bout the first ds, i tried taken it apart and pressing the L key, and it doesn't work there either so =X