How do test a transistor?

DanoNJ

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Joined
May 12, 2010
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Monroe Twp., NJ
I have a simple 3 ch controller that worked fine, till the other day. 2 ch will no longer work. It appears the controller uses 3 transistors to aid in the flashing. I'm wondering if 2 of these too a powder on me. Can these be tested in any way?
 

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