Parse Error on Conditional Sidebar

Hello,
I am a php muddlehead. I am trying to make a conditional sidebar. So, if it is on the “Investment Team” page, the visitor will see a special sidebar; on all other pages, they will see the usual sidebar.

I get this error: Parse error: syntax error, unexpected T_VARIABLE, expecting ‘:’ in /data/15/1/58/53/1384705/user/1485754/htdocs/lionpr/wp-content/themes/lionpress/sidebar.php on line 25

The code I used is below.

Thank you for any help!
Jeff

<div id="secondary" class="widget-area" role="complementary">
        <ul class="subnav">
        <?php
if ( is_page('investment-team') ) {
    echo "testing";

}?>
 <?php
                    elseif($post->post_parent)
                    $children = wp_list_pages('title_li=&child_of='.$post->post_parent.'&echo=0'); else
                    $children = wp_list_pages('title_li=&child_of='.$post->ID.'&echo=0');
                    if ($children) { ?>
                    <?php echo $children; ?>
      <?php } } ?>

			</ul><!--end sub-nav-->
		</div><!-- #secondary .widget-area -->
<?php endif; ?>