Mr Modchips have today posted quite a range of new PSP repair items, heres the listing:
Replacement WIFI Card
A replacement Wifi Card for any version Sony PSP. ON / OFF Switch with PCB
A replacement On/Off PCB with switch for any PSP version. Replacement L Key Cable
A replacement L-Key cable for any PSP version. Replacement Power and R Key Cable
A replacement Power and R Key cable for any PSP version. Replacement Volume and Home Cable
A replacement cable for volume and Home key of any PSP version.
Check out the site via the link above for more info and screens, personally i wouldnt even attempt to fix my PSP but thats cause i just kill it in the process :P