Reset rewrite rule

Hi, I have the following issue: In a theme I use, there’s a rewrite rule defined the following way:

$args = array(
    'labels' => $labels,
    'public' => true,
    'exclude_from_search' => false,
    'publicly_queryable' => true,
    'show_ui' => true,
    'query_var' => true,
    'capability_type' => 'post',
    'hierarchical' => false,
    'menu_position' => 5,
    'supports' => array('title','editor','thumbnail'),
    'rewrite' => array( 'slug' => __('service', 'framework') )
);

The problem I have is the following: The pages which i can define under “Services” Look completely crapy, so i wanted to modify them. I can just comment out that ‘rewrite’ => array….. line, but with an update this will be reset again.

Is there any way i can change that rewrite rule back to it’s defaults or make it non-existing?

Any help is appreciated…

Kind regards

Ivan Sieder