If you have RW_Tools (Which you really should.) then begin that program, then click on the following.
Route Building Tools
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Check Route or Scenarios
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"Select the Route"
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Check Selected Route
This will take a couple of minutes, but once done, you should see a list of the missing asset's. Once you have that, it will be easier for people to help you with this and point you to where you can get them, if you can.
Hope this helps. You can get the final version of RW_Tools here: (
http://www.agenetools.com/downloads.html ). There is a newer program also on the same page called TS_Tools but I do not have that installed yet, so i don't know if it works the same way or not.