I bought a 2005 Trailblazer LS and have been slowly performing maintenance and small repairs. I am attempting to remedy a code p0410. I look under the hood and notice the hose is disconnected. So, I reconnected and ran - sure enough the code reappears. I can hear the pump running so I disconnect the hose again just to be sure no moisture runs down and damages what I believe to be a good pump. Reading online, I decide to go ahead and change the air injection valve. (I know I should test but I lack the tools/expertise to do this.)When I go under the hood and start on the job, I find that when I disconnect the other hose, things are free and I can pull out half of the hose assembly. The plastic junction is broken. My question is how do I replace this hose assembly. I can find the part on line, I see on the diagram a single bolt that secures it but I don't know how to access it. Any tips?