Is it an online of offline dyansty? If it is an online dynasty, here is what you need to do.
What you need to do is create a new user profile on his PS3. Then you need to use your PSN login to connect to your PSN account. When you are loggin in (and you see your friends list, etc) go into NCAA 13. You will need to redownload the Online Pass (you do not need to buy a new one) and then you can load/view your Online Dynasties.
If it is offline, there is nothing you can do. In the future, you can transfer your game files onto a USB drive and then load them onto another PS3.
Also, there is a good chance your hard drive will be wiped clean while at the repair show so you may have lost your dynasty for good if it is offline and you did not back it up...