There will always be an area inside that is brown, that is normal. Near the bottom may be a bit more of a concern. This may be just due to being there all summer in the yard and new and future growth will cover what is now brown along the bottom. You have more time for transplanting and recovery than here in N. Illinois. If they have been well cared for this summer and you are willing gamble a bit, go ahead, especially if there is a warranty involved.