Get a list of all the servers with a specific eventid in the eventlog.
Example below is for finding eventid 6008.

$servers = gc C:servers.txt
foreach ($server in $servers)
{
    $events = Get-EventLog -ComputerName $server -LogName “System” | Where-Object {$_.EventID -eq “6008”}
    if ($events -ne $null)
    {
        foreach ($event in $events)
        {
            $time = $event.TimeGenerated
     Write-host $time $server
        }
    }
}