No lights on Air Control and Passenger A/C Control dials

I purchased my 2001 SLK 320 last July.<br>
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Few days ago, I found the no lights were not on the Air Control Dial and Passenger A/C Control Dial in dashboard.<br>
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I had already driven my car over 18,000 mile and am not sure the warranty will cover this problem.<br>
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If I need to pay, do you know how much it cost?<br>
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I got tire balance from the dealer 5 month ago and paid $60. <br>
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I noticed some vibrations on the steering wheel. Do you think that I need to get tire balance and need to pay for it again?<br>
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Other than these two problems, I am very happy with my SLK and Spring weather in Washington, DC area has been great for the SLK lovers.