Got my car back from service to have the tires rotated and an alignment (I hit a bag of cement on the freeway with my left front tire and since then the car was pulling to the right), and a small number of little things checked out/fixed (seat belt rattles, tape protruding under the driver's mirror, etc.). One of the items performed that I didn't ask for says: - "Concern: Modify Rear Arch Liners" - "Corrections: Trim rear base and recessed corners of LH/RH rear arch liners. Inspect hoses." Anybody know what this is about? What are the rear arch liners?