Is Thinkpad 360 SX33 CPU socketed, therefore upgradeable?

[zack@netcom.com (Zack T. Smith)]

Hi,
 
This is really several questions:
 
1. Is the SX33 CPU in the Thinkpad 360 socketed?
 
2. Does it run at 3.3 volts or at 5 volts?
 
3. Can I take out the SX33-SL and put in a DX2/66 or DX4/100?
 
4. Would a CPU swap require a heatsink?
 
5. Would a CPU swap require a new bios?
 
I've heard that the DX2/66 chips are only produced in 5-volt versions.
Is the DX4/100 a 3.3 volt part? Which might I be able to use with the 360?
 
Thanks for any info.
 
Zack Smith
zack@netcom.com