As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PREFLIGHT INSPECTION PILOT, DISCOVERED ONE FREQUENCY ADAPTER WITH A 20MM CRACK IN THE ELASTOMER. MM LIMITATION IS 10MM. THIS IS A COMMON FAILURE WHICH OCCURS AT HALF LIFE OR LESS FOR THIS PART WITH A 3000 HOUR SERVICE LIFE LIMIT. THE OLDER PN ELASTOMER FOR MOLD RARELY FAILED. SUGGEST RETURNING TO THE OLDER FORMULATION. (K)