On my RC30, the creaking comes from the drive rollers on the drive sprocket, kinds irritating, but not much you can do about it. One note, how many hours do you have on the new machine, now? The track tension on the RC30, when the tracks get loose, makes the squeeks and creaking a lot worse. I don't know if the SR80 has a similar adjustment, or if its automatic, but check your manual, and your track tension, in that order.