Join Date: Mar 2006
Location: In a cardboard box by Alki beach.
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If you have actually checked them out and are sure they're good, cool. But, don't assume that the housings are good just because it's new or new-ish. Most of the cable housing problems I have had were with new bikes. A couple of them had derailleur to frame loops that were too short, one didn't have a cable end on one end of the frame-der loop and the wires came poking out in fairly short order (as R-G mantioned), and a couple had kinked housings - probably from shipping or handling in the shop.
All that said, R-G is probably right that the cable tension just needs a bit of a tweak. If you have a good shop that did the tune-up recently, you can probably talk them into a quick adjust for free as long as that's all it needs. Also, make sure the derailleur and the idler pulleys are free of gunk.