No idea about the TC light, maybe a bad switch or smth. The shock swap to me is a 20 minute job now, since I've done it a couple times...

) Yeah, PM, no problem. But my instructions would be:
1. Leave the car on the ground. Remove the boot from the inside the trunk. Loosen the nut (15 mm I believe) and take it off.
2. Jack up the car. Leave the wheels on. The top of the shock slides out.
3. Support the car and take the bottom bolt out. I think it's 21mm.
4. Install reversing the instructions. Just let the car slowly to the ground, while aiming the top bolt of the shock through the hole.
TA-DAAAHHHHH!!!!! Your Catera has officially been GTO'd
