The harmonic damper pulley on my 06 wobbles, but the one on my 04 is steady. On the 06 this causes a squeak when the engine is cold and wears out belt tensioners every so often. I haven't replaced it, because they don't make it anymore. I could take a chance one a used on, but the bolt that mounts it is a one time use (it stretches once when installed, may break if tried a second time). The bolt is close to impossible to get too.
Some (many?) 04s got a defective parking brake module from the factory. There was a TSB out warning dealers to replace 04 parking brake modules during the warranty period if there were any warnings or customer complaints.