SAM Powershell monitor returns "Not Defined" as the output

I've seen several discussions dance around this issue; but, I can't seem to find the missing piece.  So ..... here goes:

I'm trying to set up a Powershell Monitor in SAM 6.1.1. I'm using good credentials tested via Powershell Console.  I've also configured WINRM per another support article.  I've set this up as a remote monitor run on the NPM server.

Here's the script:

Clear-Host

$MC3 = "hqmailcas3"

$DB1 = "hqmaildb1"

$rebootmc3 = 0

$BootedMC3 = Get-WmiObject -Class Win32_OperatingSystem -Computer $MC3

$MC3UP = $Booted.LastBootUpTime

$BootedDB1 = Get-WmiObject -Class Win32_OperatingSystem -Computer $DB1

$DB1UP = $BootedDB1.LastBootUpTime

if ($MC3UP -gt $DB1UP) {$rebootmc3 = 1}

Write-Host 'Statistic: ' $rebootmc3

exit ($rebootmc3)

Where am I going wrong?  I'm not getting an output for this.