We do not recommend DIY repairs on your Rebel. The service manual is proprietary, therefore you will not find it on this site.
If your Rebel requires service, please sign into your My Canon Account and send it to our facility to allow a trained Canon employee perform the repair. You can start the process at canon.us/account
"We do not recommend DIY repairs on your Rebel."
You need to heed Stephen's advice and let Canon do the repair. Besides even if you can replace the shutter assemble, not that difficult of a task, you will not be able to calibrate it.