I think I am on the trail! Even though I drained the smokestack before opening the RS3, I still had some smoke fluid to deal with once inside. Some of the drops though, are brown - I have never added anything that wasn't clear! I can't get the circuit board to remove from the motor unfortunately, 1 of the 3 screws is fighting me. I can see the resistor you spoke of through a opening in the circuit board. From what I can see it's all gunked up. Almost like ear wax (gross I know) but that's what I see.
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