Thanks for your reply esmi. The testimonials appear to be inside the .colRight in the sidebar.php file. Am I wrong?
<!-- begin colRight -->
<div id="colRight">
<!-- Search box -->
<div id="searchBox">
<h2>Search the site</h2>
<form id="searchform" action="" method="get">
<input id="s" type="text" name="s" value=""/>
<input id="searchsubmit" type="submit" value="SEARCH"/>
</form>
</div>
<?php
/* Widgetized sidebar */
if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('sidebar') ) : ?>
<?php endif; ?>
<!-- Random Testimonial -->
<h2 class="testimonials">Random Testimonial</h2>
<div class="boxRight testimonialsList">
<ul>
<?php
$testimonial = new WP_Query($query_string.'&cat='.get_option('wise_testimonials_id').'&showposts=1&orderby=rand');
if ($testimonial -> have_posts()) : while ($testimonial -> have_posts()) : $testimonial -> the_post();
?>
<li><span>~ <?php the_title(); ?></span>
<p><img src="<?php if ( function_exists('p75GetThumbnail') )echo p75GetThumbnail($post->ID); ?>" alt="<?php the_title(); ?>" />"<?php content('1000'); ?>"</p>
</li>
<?php endwhile;
endif; ?>
<li><a href="<?php echo get_category_link(get_option('wise_testimonials_id') )?>"><strong>Read more testimonials »</strong></a></li>
</ul>
</div>
<!-- end random testimonial -->
<!-- Twitter box -->
<h2 class="twitter">What's the little bird saying?</h2>
<div class="boxRight twitterList">
<!-- <li><p># <a href="#">@conorpegypt</a> why not just access it from Rockwell's theme documentation? <a href="#">https://bit.ly/6owa235</a><br /> <span>about 4 hours ago</span></p></li> -->
<?php aktt_sidebar_tweets(); ?>
<!-- <li><span><?php aktt_latest_tweet(); ?></span></li>
<li><a href="<?php echo get_category_link(get_option('wise_twitter_link') )?>"><strong><a href="<?php echo get_option('wise_twitter_link') ?>">Follow us »</a></strong></a></li> -->
</div>
<!-- end twitter box -->
</div>
<!-- end colRight -->