I believe that the choice of steel quality on these machines is very poor as it was to keep costs down. Like many others, the steel lines that go over the driver's strut well has corroded to the point of leaking all of the power steering fluid. Thankfully my wife was close to home and it wasn't left to run that long. I did find on YouTube some videos of how to cut out the bad sections and replace with new steel lines with compression fitting unions. It's surprising to see a 13-year old vehicle have this much corrosion problem!

Update from Apr 10, 2019: It has been a few months since I replaced the bad section. I should add that for the high pressure line going from the pump to the rack and pinion that you need to use professional union fittings that will hold up to very high PSI. I found Swagelok fittings and they are great! They are stainless steel and feature a double ferrule design that will not slip off like a regular brass plumbing fitting. They do run about $16 a piece so they are not cheap but are essential! The low side can use regular fittings.

The repair is still working without any problems!

The power steering lines rust out above the strut tower eventually spewing out all the power steering fluid. This is a common problem on all 2002-2009 Trailblazers, Envoys & Bravadas. Clearly a manufacturers defect and should easily have been a RECALL! This condition can certainly lead to crashes and potentially injuries, death and property damage. The way these lines are routed is the most pathetic way possible and GM used cheap Chinese metal for these lines. For the backyard mechanic, this job can take easily 10 to 15 hours to replace the lines. And shops want between $900-$1200 to do this job. GM should pick up the tab for everyone that has this problem or reimburse for those who already had it fixed. Come on GM...you guys know you effed up, do the right thing and recall these NOW!!!!!