How to find and update the contents of a table?

I am currently helping out a friend with his website, I am doing so through a SVN, I have been updating information for him, however I have encountered a list of dates where I cannot find the source information for so I cannot update it.

Below is the code which I believe is pointing to the code I want to update "$item.ClassHours" how do I find where the source information is?

<table class="stripe-table" border="0" cellspacing="0" cellpadding="0">
                        <tbody>
                            <tr>
                                <th>Class Choice</th>
                                <th class="clear-bg">Schedule</th>
                                <th>Class Hours</th>
                                <th class="clear-bg">Level</th>
                            </tr>
                            <volist name="article.content_complex.part_time" id="item">
                                <notempty name="item.Schedule">
                                    <tr>
                                        <notempty name="item.ClassChoice">
                                            <th <notempty name="item.ClassChoice_rowspan">rowspan="{$item.ClassChoice_rowspan}"</notempty> >{$item.ClassChoice}</th>
                                        </notempty>

                                        <td>{$item.Schedule}</td>
                                        <notempty name="item.ClassHours">
                                            <th <notempty name="item.ClassHours_rowspan">rowspan="{$item.ClassHours_rowspan}"</notempty> >{$item.ClassHours}</th>
                                        </notempty>
                                        <notempty name="item.Level">
                                            <td <notempty name="item.Level_rowspan">rowspan="{$item.Level_rowspan}"</notempty> >{$item.Level}</td>
                                        </notempty>
                                    </tr>
                                </notempty>

                            </volist>
                        </tbody>
                    </table>