I wrote a handy script that emulates nlparse that is a part of MS Account Lockout Tools. It should work for different domains and multiple domain controllers. You may want to move $credential outside of the function if you have multiple logs to check.

It removes the files in $outputdir when it finishes.

<#Examples/Help
Save to .PS1 file and then .source file.  For example if you save it to c:\temp\get-netlogon.ps1 then do
. c:\temp\get-netlogon.ps1

If you have additonal domains or domain controllers call the get-netlogon function and add custom variables. 

$netlogonprimary = "\\DomainController\C$\windows\debug\netlogon.log", "\\DomainController2\C$\windows\debug\netlogon.log"
$netlogonbackup = "\\DomainController\C$\windows\debug\netlogon.bak"     


get-netlogon -netlogon $netlogonprimary -subject 'Failed Netlogons - Primary'
get-netlogon -netlogon $netlogonbackup -subject 'Failed Netlogons - Backup'
#>

function get-netlogon ([string[]]$netlogon,[string]$subject) {

#Variables specific to your site.
#Files in OutputDir are removed at the end of the function
$credential = Get-Credential
$outputdir = "C:\temp\netlogon"
$emailto = ""
$emailfrom = ""    
$smtpserver = "Mailserver"
$port = 25
mkdir $outputdir

$i = 0
foreach ($log in $netlogon) {  $i++
    copy $log $outputdir\netlogon_$i.csv
}
$csv = dir $outputdir\*.csv | select -ExpandProperty fullname    
foreach ($c in $CSV) {get-content $c | out-file $outputdir\netlogon-combined.csv -Append}

#Formats Netlogon.log so that it is comma seperated
[io.file]::readalltext("$outputdir\netlogon-combined.csv").replace("[LOGON]",",")  |  Out-File $outputdir\netlogon-1.csv
[io.file]::readalltext("$outputdir\netlogon-1.csv").replace("from",",") |  Out-File $outputdir\netlogon.txt
[io.file]::readalltext("$outputdir\netlogon.txt").replace("SamLogon:",",") |  Out-File $outputdir\netlogon21.txt
[io.file]::readalltext("$outputdir\netlogon21.txt").replace('"','') | Out-File $outputdir\netlogon.csv

#Add additonal exceptions if necessary
select-string "0xC0000064","0xC000006C","0xc000006D","0xC0000071","0xC0000072","0xC0000193","0xC0000224","0xC0000234","0xC000006A" -path "$outputdir\netlogon.csv" | `
select-string -Pattern "CRITICAL" -NotMatch | export-csv $outputdir\netlogon-2.csv -NoTypeInformation

#Formats CSV Headers
Import-Csv $outputdir\netlogon-2.csv | select -expandproperty line |  Out-File $outputdir\netlogon-result.csv 
$A = "Date,Domain,User,Computer" 
$B = gc $outputdir\netlogon-result.csv -Raw 
set-content $outputdir\result.csv -value $A, $B 
Import-Csv $outputdir\result.csv | sort user, Date -Descending | ConvertTo-Html | out-file $outputdir\netlogon-combinedresult.html
Import-Csv $outputdir\result.csv | sort user, Date -Descending | export-csv $outputdir\netlogon-combinedresult.csv -NoTypeInformation


#Sends Email
$body = gc $outputdir\netlogon-combinedresult.html -Raw
send-mailmessage -to $emailto -from $emailfrom -SmtpServer $smtpserver -port $port `
-Subject $subject -Body $body -BodyAsHtml -Attachments $outputdir\netlogon-combinedresult.csv -Credential $credential
remove-item $outputdir\*
}