Click on N for Notey and then click on the ? question mark. It will show you everything he has said. Chances are it will tell you which "room" to get the item from at the junk yard. I can't exactly remember it, but you need to get something, so look around the main area if he doesn't say specifically (i.e. my the buses, stacked cars, crane, etc).
Hope that helps some!
~Vicks
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