They used to do this many moons ago but they stopped. I don't think they've started doing it again. Maybe Bjorn can confirm.
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I don't believe they've done tech classes for at least 6-7 years. I attended one in 2004 or 2005. Truthfully, you'll never learn as much in a training class lasting 1-3 hours as you will just working on markers and iterating trying to solve problems. I attended the class but got to understand them by working on them at Pevs. And working on more of them. And then more. And then more.
The last time i ever heard of any tech class other than tippmann was in 06 or 07 when j took a pe and bl class.
With the internet now though you can learn allot more in even 30 minutes compared to the few hrs the classes were.