As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT COMPLAINED OF WING DE-ICE BOOTS STAYING INFLATED. REMOVED VALVE AND FOUND IT STUCK IN INFLATION MODE DUE EXCESSIVE SPACE BETWEEN THE GASKETS. THIS ALLOWS AIR PRESSURE TO VENT WHICH IS THE ACTUATION MODE FOR INFLATION. IT APPEARS THAT THE SQUEEZE ON THE RIVETS MAY BE TOO LIGHT. PART WAS REPLACED.