This mob has the spell Throw Wrench: . The spell does somewhere around 50 physical damage and does NOT set off the global CD. What does this mean for you? If you can spam it enough, the damage is infinite.
Now, down to the point. What you need is a level 30+ priest, with the Mind Control spell. Mind control a Lebrous Technician (Can be found near the backdoor entrance, among many other places in the instances) and create a macro that consists of the line:
Code:
/cast Throw Wrench
It should be noted that with enough spamming, Thermaplug will go down in well under 10 seconds.
Thanks for reading, even if this doesn't make it in.