Change the layout page of a publishing page

Issue

Update an exiting page to a new layout page and need to update all my sites page to the new layout page.


Code
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Site that I would like to implement the change on
$StartWeb="https://intranet.peelschools.org/ltss/pmo/PMLC"

#filter to only the sites that I want
$subsites = ((Get-SPWeb $StartWeb).Site).allwebs | ?{$_.url -like "$StartWeb*"}
$pWeb = [Microsoft.SharePoint.Publishing.PublishingWeb]::GetPublishingWeb($subsites)
$pSite = New-Object Microsoft.SharePoint.Publishing.PublishingSite($subsites.Site)

#need the root of the site collection to get the layout page from
$rootSite = Get-SPSite https://intranet.peelschools.org
$site =$subsites
$lookForList = "Pages"

   foreach($subsite in $subsites){

            $spPubWeb = [Microsoft.SharePoint.Publishing.PublishingWeb]::GetPublishingWeb($subsite)
            $pages = $spPubWeb.PagesList
            $myLayout = $siteLayouts["/_catalogs/masterpage/PDSB/Content.aspx"]

            #Add site content types to the list
            $ctToAdd = $rootSite.RootWeb.ContentTypes["Intranet SP2013"]
            $ct =  $pages.ContentTypes.Add($ctToAdd)
            write-host "Content type" $ct.Name "added to list"  $pages.Title
         

            foreach($item in $pages.Items)
            {
                $pubPage = [Microsoft.SharePoint.Publishing.PublishingPage]::GetPublishingPage($item)
               
                if ($pubPage.Title -ne "Forms" -and $pubPage.Title -ne "All Documents" -and $pubPage.Title -ne "Documents")
                {           
                    $pubPage.CheckOut()
                    $pubPage.Layout = $myLayout
                   # $pubPage.item["Show Resources in page"]=$true
                   $pubPage.
                    $pubPage.Update()
                    $pubPage.CheckIn("")
                    $pageFile = $pubPage.ListItem.File
                    $pageFile.Publish("")
                 }                     
            }
            Write-Host $subsite.url  "is done"
 }

$subsites.Dispose()
$rootsite.Dispose()

$site.Dispose()