Found the culprit the other day, and got the car fixed this evening. The vacuum line that was disconnected was the line that was supposed to go to the solenoid for the resonance flap. I had to pick up some parts for a side job I'm doing on a friend's BMW, so I was at the parts store anyway. Grabbed some vacuum line, replaced the lines for the resonance flap, and she's good to go. Just gonna drive her to work tomorrow to confirm the light stays out and smoke it for good measure, but so far, so good.
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