After searching several threads on the forum in regards to the ticking noise being heard on several Sequoia's, I am fairly confident that it is not a cracked manifold, not the injectors, and not piston slap. A couple people have mentioned that the rubber boot around the steering column can disintegrate or tear. While I was crawling around under the vehicle the other day, I decided to check out the boot. I could feel that there was definate damage to the weather seal(boot). Has anyone replaced this boot themselves? I did not find any steps to replace this. Is it best to let a mechanic perform this replacement?