def update_load_balancer(access_token, subscription_id, resource_group, lb_name, body):
endpoint = '<STR_LIT>'.join([get_rm_endpoint(),<EOL>'<STR_LIT>', subscription_id,<EOL>'<STR_LIT>', resource_group,<EOL>'<STR_LIT>', lb_name,<EOL>'<STR_LIT>', NETWORK_API])<EOL>return do_put(endpoint, body, access_token)<EOL>
Updates a load balancer model, i.e. PUT an updated LB body.

    Args:
        access_token (str): A valid Azure authentication token.
        subscription_id (str): Azure subscription id.
        resource_group (str): Azure resource group name.
        lb_name (str): Name of the new load balancer.
        body (str): JSON body of an updated load balancer.

    Returns:
        HTTP response. Load Balancer JSON body.