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I bet that $100 quote is NOT synthetic.
The info I have indicates the Service Light can be reset by:
1. Holding down the trip rest button, continuing to hold the button down even after the trip mileage has been reset...
2. Turn the ignition key to the "II" position
3. Continue to hold the reset button until a new menu appears
4. When the new menu appears, let go of the button, then push it again until the "rst" option appears
5. Then press the reset button once more to reset the service light