Copy array and modify one value in Rust

I have an struct with a refence to an array of type T:

pub struct myStruct<'a, T> {
    pub data: &'a [T],
}

I want to modify one element of this array and check the result of an operation. for that I am trying to copy the array, modify the value and execute the operation:

pub fn check_value(&self, data: &T, position: usize) -> bool {
    if position >= self.data.len() {
        return false;
    }
    let array_temp = Box::new(self.data);
    array_temp[position] = *data;

    return mycheck(array_temp);
}

I am getting this error:

error[E0594]: cannot assign to `array_temp[_]` which is behind a `&` reference

I would like to know how to copy the array and modify the value or just modify directly the value in the original array (data) and restore the original value later.

Here you have a complete code to compile

pub struct MyStruct<'a, T> {
    pub data: &'a [T],
}

impl<'a, T> MyStruct<'a, T>
where
    T: Copy,
{
    fn mycheck(&self, myarray: &[T]) -> bool {
        if myarray.len() > 0 {
            return true;
        } else {
            return false;
        }
    }

    pub fn check_value(&self, data: &T, position: usize) -> bool {
        if position >= self.data.len() {
            return false;
        }
        let array_temp = Box::new(self.data);
        array_temp[position] = *data;
        return self.mycheck(&array_temp);
    }
}

fn main() {
    println!("Hello World!");
}