Just had a persistent, although intermittant, rattle fixed in my dash. Not sure I would describe problem as a creak but then terms rattle and creak are not precise, so . . . Our RX 330 has 5,000 miles. Completely different sound now. No rattles and entire dash is now rock-solid (like a Lexus should be).
Required 2 1/2 days for my dealer to fix. I didn't see the enire bill (going to Lexus) long enough, but fixing the rattle cost about $887 and had one part that cost about $19.
I had already had the glove compartment ratttle fixed with additional insulation at 1,000 miles. I think we are still getting a harmonic rattle from the right side of the car.
Other than the rattles, we LOVE this vehicle. Who would have thought an SUV could actually be fun to drive? (We do have AWD.) :D