Corrupt FIT File Repair Requests

I've recently completed a 366 mile multi day cycling activity over 3 days. I paused each night and did not save until the end. The garmin connect upload shows the correct total mileage, but the first 2 days are missing. Please could someone point me in the right direction or even see if they can correct the 'fit' file for me if possible. I'd really like to see the full ride. Each day I started a new course on the garmin.