How do you repair rear running and brake led lights on a mazda 3 2005?

To repair the rear running and brake LED lights on a 2005 Mazda 3, first, check the fuse related to the tail lights in the fuse box and replace it if it's blown. If the fuse is intact, inspect the LED light assembly for any faulty connections or damaged LEDs. You may need to remove the tail light assembly by unscrewing it from the vehicle and checking for corrosion or loose wiring. If the LEDs are damaged, you might need to replace the entire assembly, as individual LEDs are typically not replaceable.