I have an old ceiling fan that has a three way pull string switch which is working properly(1. off,2. High, and 3. current to a rotary speed control switch). The speed control switch is broken. I have not been able to find a new switch as there is not a manufacturer's name on the switch, however it has several numbers. They are 137(underlined), 8145, 5017-0003-000. Can anyone tell me where to find a replacement switch?

Ok, you mention a rotary switch and a pullchain. Which one do you need to replace?

Ceiling fan pull chain replacement and repair - Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-pullchain-replacement-and-repair.php)

Ok, you mention a rotary switch and a pullchain. Which one do you need to replace?

Ceiling fan pull chain replacement and repair - Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-pullchain-replacement-and-repair.php)

I need a replacement rotary speed switch

Should be available at any Home Center or Hardware Store. What make/model is the fan?

You can replace/fix the pullchain too, see the link above.