How can I find source hours (time my lamp has been on) for a Cary 7000?

I am interested in keeping a run log of when the lamps in a Cary 7000 get switched and how long the lamp has been on for when it gets switched. The help files say that the time the lamp has been on (source hours) can be reset and it goes on to say how but it does not indicate where to find that window. Does anyone know where I can find how long my lamp has been on for and how I can reset the time?

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