Originally Posted by
bOsscO
The mechanic confirmed he's not a carbon fibre expert but he did not feel that the shell could be re-bonded or epoxied back to the frame with any chance of it being round or having long term success.
Ruckus Composites (there may be others as well) can do the repair. They replaced an ovalized BB shell on a S5 for me and it came out perfect. (My mechanic also said it couldn't be fixed.)