markmich,
Try looking in wp-content/themes/[your-theme]/woocommerce/cart/cart.php
As I said earlier, these kinds of issues can be avoided if people edit templates in this manner:
1. Make a custom change to an overriding template.
2. Document that change somehow.
3. When a new template version is released, use it as the new overriding template and apply your documented changes to it.
This way, you’ll always be using the newest versions of the templates. And you won’t have to deal with issues like this cropping up in the future.