As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED MX, A MECHANIC NOTED THAT DURING CLEANING OF THE PROP DEICE SLIP RING THAT THE DIELECTRIC FILLER IN BETWEEN COPPER RINGS APPEARED TO BE DETERIORATING. THE PROPELLER WAS REMOVED FROM SERVICE. THE PROP DEICE SLIP RING WAS R & R AND THE PROP RETURNED TO SERVICE. THE DAMAGED DIELETRIC FILLER IS APPROX A 6 INCH ARCH, .250 INCH IN WIDTH AND .250 DEEP. THE DAMAGE WAS LOCALIZED TO THE MIDDLE IN BETWEEN 2 COPPER RINGS.