My Umbraco map was showing up fine then just created a blank space. site is using umbraco and code shows up in firebug any ideas please.

http://www.teeslaw.co.uk/map-of-locations/

heres the backend code cshtml script file:

@using umbraco.MacroEngines
@inherits umbraco.MacroEngines.DynamicNodeContext
@{
    const string widgetName = "widget_all_office_locations_map";
    var officeLocations = Model.Descendants("OfficeLocation");
    if(!officeLocations.Any()){
        officeLocations = new DynamicNode(-1).DescendantsOrSelf("OfficeLocation");
    }
    if (PageData["HasMapWidget"] != null){
        <p>Map is already rendered on @PageData["MapWidget"]</p>
        return;
    }
    PageData.Add("HasMapWidget", true);
    PageData.Add("MapWidget", widgetName);
}
<div class="section">
    <div class="section-heading">
        <h3>@Parameter.Title</h3>
    </div>
    <p class="summary">@Parameter.Summary</p>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"> </script>
        <script type="text/javascript">
            var geocoder;
            var map;

            function initialize_map() {
                geocoder = new google.maps.Geocoder();
                var latlng = new google.maps.LatLng(52.879076,-1.873169);
                var mapOptions = {
                    zoom: 7,
                    center: latlng,
                    mapTypeId: google.maps.MapTypeId.ROADMAP,
                    disableDefaultUI: true
                }
                map = new google.maps.Map(document.getElementById('map_canvas_large'), mapOptions);
                var addrs = [];
                var mrks = [];
                    @foreach (var office in officeLocations){
                        var address = office.Address.Replace("\r\n","").Replace("\n","");
                        var addressHtml = @library.ReplaceLineBreaks(office.Address).Replace("\n", "");
                        <text>mrks.push('<div style="width:300px"><h4>Tees Solicitors @office.Name</h4><address>'+escape("@Html.Raw(addressHtml)")+'</address><p><strong>T</strong>: @office.TelephoneNumber</p></div>');</text>
                        <text>addrs.push('@address')</text>
                    }
                for(var i=0;i<addrs.length;i++) {
                    codeAddress(addrs[i], mrks[i]);
                }

            }

            var iws = [];
            function codeAddress(address, contentString) {
                geocoder.geocode({ 'address': address }, function(results, status) {
                    if (status == google.maps.GeocoderStatus.OK) {
                        //map.setCenter(results[0].geometry.location);
                        var marker = new google.maps.Marker({
                            map: map,
                            position: results[0].geometry.location
                        });

                        var infowindow = new google.maps.InfoWindow({
                            content: unescape(contentString)
                        });

                        google.maps.event.addListener(marker, 'click', function() {
                            for(var i=0;i<iws.length;i++) {
                                iws[i].close();
                            }
                            infowindow.open(map, marker);
                        });

                        iws.push(infowindow);
                    }
                });
            }

            $(function () {
                initialize_map();
            });
        </script>
        <div id="map_canvas_large" class="span6" style="margin-left:0;height: 724px"></div>
</div>