As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CUSTOMER REPORTED DEICING FLUID FOUND IN THE BATTERY BOXES. AT EVERY BATTERY INSPECTION WE ARE FINDING TRACES OF DEICING FLUID. THE ONLY LOGICAL EXPLANATION IS THAT IT IS ENTERING THROUGH THE VENT SYSTEM. WE HAVE NOT BEEN SUCCESSFUL IN PREVENTING THIS FOR SOME TIME NOW.