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==Service===Cooling fan: The cooling fan is connected to the AVR board. There is a thermister on the back panel inside. It can be removed so that the fans run continuous. This will burn up the OEM fans if ran continuous. Computer fans can run continuous. If the fan stops you will loose the AVR unit, very hard to find and now you have a door stop. The OEM fans are still around, but getting somewhat rare. It is better to replace them with computer fans, which are a lot less of a problem.