That is one of them but taking a further look at the parts being used, you probably have more damage than that. Even the rectifier is only rated for 100V peak voltage and you hit it with over 120V. You would need to connect the device up to a landscape transformer and begin doing some voltage measurements to see what is and isn't working such as the rectifier, the 5V regulator, the 3.3V regulator, and the electrolytic cap (big one next to the rectifier). Also see of you blew the fuse. I would remove the PIC and the 485 before testing.