Point this to a Directory Service log in CSV format, and it counts each unique 1216 event and tells you how many times that particular type of 1216 event occurred.

Check1216Errors.ps1

param($file)

$reader = new-object System.IO.StreamReader($file)
$errorsDictionary = new-object 'System.Collections.Generic.Dictionary[string,int]'
$nextLineIsError = $false
while ($null -ne ($buffer = $reader.ReadLine()))
{
    if ($nextLineIsError)
    {
        $nextLineIsError = $false
        if ($errorsDictionary.ContainsKey($buffer))
        {
            $errorsDictionary[$buffer]++
        }
        else
        {
            $errorsDictionary.Add($buffer, 1)
        }
    }
    elseif ($buffer.StartsWith("Error value:"))
    {
        $nextLineIsError = $true
    }
}

$reader.Close()

$errorObjects = @()
foreach ($key in $errorsDictionary.Keys)
{
    $obj = New-Object PSObject
    Add-Member -InputObject $obj -MemberType NoteProperty -Name Count -Value $errorsDictionary[$key]
    Add-Member -InputObject $obj -MemberType NoteProperty -Name ErrorText -Value $key
    $errorObjects += $obj
}

$errorObjects