Hi Tim,
You can find Genil Class from Web UI component. First you need go to run time repository in the BSP Component check the model component set. This set will be having Genil Component assigned to it.
Go to CRM---Cross App Comp---Genil --Basic Settings--Component.
For every Genil Component you can find implementation class which is assigned to it.
Hope above details will help you.
Thanks,
Kamfrk.