Got this, basically plane computer was down have to do repair in CUN for 3+ hours, I guess it's under "Situations within airline control but required for safety purposes"?

We are in receipt of your claim under the Air Passenger Protection Regulations for flight AC933 on January 8, 2024. We are sorry for the inconvenience caused by the delayed arrival at your final destination.

In this instance, the compensation you are requesting does not apply because the cancellation was due to safety reasons. To be specific, flight AC452 was affected by unscheduled but required maintenance. As we trust you understand, we can only operate when conditions permit as the safety of our customers and crew is our utmost priority.