RE-Building A123 Packs

[JThiessen]

I have 3 A123 packs that appear to have some bad cells (I have another thread on that). Today I want to take one of them apart and I need to find the bad cell. They are 2S2P packs, and the last charge only took them to 3.3V.
1) How do I check for the bad cell? Do I have to completely disassemble the pack? Or can I use a multimeter to measure each cell somehow (while its still assembled)? I'm fairly certain I can figure out which "side" the bad cell is on, but then how do I isolate which one is bad.
2) Once I figure this out, I want to try to charge that cell. How do I manage this? Should I solder on a temporary plug? Somehow clamp on some wires? Can I do this with the pack assembled?
3) When taking apart packs, I assume I should have my iron on high. I've seen something about de-soldering braid. What is that, and should I use it?
4) Anyone want to volunteer for this???!???!!!