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As a follow-up to my previous post, I completed the installation of the secondary air pump replacement yesterday. It was very straightforward. I installed the vibration-dampening rubber posts on the pump, and then affixed the pump to the pump mount via the posts. The hoses and electrical connectors were all returned to their appropriate places on the pump. Unfortunately, I wasn't able to verify the results until this morning since the pump is activated only when the engine temperature is sufficiently cold (I think). I noticed that the deep engine note present during the absence of the pump was gone and the pump sounded like it was running. Everything seems to be back to "normal", woohoo!

The 'check engine' light is still active, so I'll need to reset it soon. My options are to have a mechanic use a proper reset tool, or to briefly disconnect the battery from the electrical system. The latter will likely require the radio code to be re-entered. Fortunately, I have the code and can simply punch it in. I might try this over the weekend. The total cost of the repair is listed below: