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Yes, it's the multi switch in the steering coloumn. This switch is a known problem, but GM won't issue a parts recall because the problem wasn't found within the first 10 model years. The problem is that as electricity flows, it generates heat at the switch contacts and these contacts warp and won't make proper contact.
I've played with the signal lever and found that if I pull back just slightly while using the brakes the brake lights activate. Just need to find a way to keep the lever in position until I can afford replacing the switch.