'Link down' Trigger. How it works?

[majster]

Hello!

I've got a problem with one trigger on Windows hosts which

Trigger definition looks like that:

Problem: {$IFCONTROL:"Microsoft Network Adapter Multiplexor Driver"}=1 and ({myHostname.domain.local:net.if.status["Microsoft Network Adapter Multiplexor Driver"].[B]last([/B][B])[/B]}=2 and {myHostname.domain.local:net.if.status["Microsoft Network Adapter Multiplexor Driver"].[B]diff([/B][B])[/B]}=1)
Recovery: myHostname.domain.local:net.if.status["Microsoft Network Adapter Multiplexor Driver"].[B]last([/B][B])[/B]}<>2

Microsoft Network Adapter Multiplexor Driver - it is my bonded interface (2 interfaces bonded in NIC teaming in Windows Server)

It always encouter a PROBLEM state, and I don't want to disable it not knowing what is the problem. I could figure it out if I understand expression- which unfortunately I don't :/
Can you help me understand it? What is that Trigger checking out?