This indicates that you have the most recent "tower" shaped version of the AirPort Extreme.
IF....the product is less than 1 year old, Apple will replace the AirPort for you.
IF....you have AppleCare on a Mac in effect, then the AirPort Extreme might be covered for up to 3 years from its purchase date. The "rules" are complicated, so you will need to get with Apple Support for details.
IF.....the AirPort Extreme is not covered.....AND.....you are a good do-it-yourself type person, it is possible to open up the AirPort Extreme and clean out the fan. Even better, replace the fan.
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A shop could probably perform the service and fan replacement as well, but the price of service would likely exceed the cost of a new AirPort Extreme.