Toshiba does not provide any data recovery service, and your data will not be available after repair.
As for the repair process for Toshiba HDD, please refer to the pages of "Warranty Support" and "FAQ". Where we handle the repair process for direct customers, Toshiba policy is to fully respect the confidentiality of your data. Therefore all data on any of drives will be rendered inaccessible as a result of the repair process. This serves to prevent misuse any of the data stored on your drive.
If you are in urgent need of the data on your defective drive, please contact specialized data recovery companies.