Different Main Menu for Each Location

Not sure if this is strictly a Mantra Theme issue or not, but I’m building a site for a company that has three locations. I need to have the front static page to have a menu item for each location, then each location will have their own menus. I realize there is a better way of doing this, but let’s just say they won’t budge from this concept. My idea is to write a series of php if then statements that will display the correct menu based on the users initial selection from the front page. The problem is I can’t locate the code that calls the main menu, this is where I think it may be a Mantra issue specifically. Can anyone point me to the code that calls or build the main menu? I’ve been looking for WAY too long and this is the first time I’ve ever consulted a support forum so I’m hoping it’s a positive experience.. 🙂 Thank you in advance!