Years ago I bought a Duo. I was warned that, despite the manufacturer's claims, it wasn't waterproof/water resistant. I got it with a 21 LED inset that Alex sold. It's been a great lamp.
Then, I dug it out the other day, it was covered in mud, so I washed it. Sure enough, the water coming out of the faucet killed the lamp. I am fortunate enough to work with a bunch of EEs, so I've had a couple of them working on it. The second guy, who built his own LED biking light (wow! 3 giant Seoul bulbs) seems to be taking care of me. He speculated that the switch might be bad.
So my question is, can one buy replacement Petzl parts? Hank?