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Fan always on maximum RPM

Since a couple of weeks the CPU fan of my XPS 159530 is continuosly running at 5800 RPM. Doagnostic tool shows current: 5800, high: 5800, low: 5800. Video Fan, however shows current: 4800, high: 4800, low: 2000. CPU External Termal Sensor shows: current: 97 C, high: 97 C, low: 97 C. Primary Battery Sensor, however, shows: current: 24 C, high 24 C, low 24 C. Is there a way to modify the settings of CPU fan?
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