What is the right mailing address for T1135? TT has one and CRA has another: https://www.canada.ca/en/revenue-agency/services/forms-publications/forms/t1135.html

You should use the address that is on the last page of the t1135.

Winnipeg Taxation Centre
Data Assessment & Evaluation Programs
Validation & Verification Section
Foreign Reporting Returns
66 Stapon Road
Winnipeg MB R3C 3M2