No, haven't opened anything. It's frustrating issue to diagnose because it only happens under certain conditions. That's probably something I can do pretty easily with no downside though.
I don't want to get into the process of buying a part, waiting for rain, swapping it out, doesn't work, another new part, more rain, etc.
The car was made into a Stage 2 at DMCMW in 2012 so it's possible some wear components that were changed at the time are starting to age out. Particularly given I drive my car.