As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED MAINT ONE ADAPTER OF SET OF 3 FOUND TO HAVE INTERNAL/EXTERNAL ELASTOMER CRACK EXCEEDING MM LIMITATIONS OF 10MM. THIS IS A VERY COMMON FAILURE THAT OCCURS AT HALF OR LESS OF THIS PARTS SERVICE LIFE LIMIT OF 3000 HOURS. THE OLDER PN ADAPTERS USED A DIFFERENT ELASTOMER FORMULATION THAT ALMOST ALWAYS LASTED 3000+ HOURS. SUGGEST THIS FORMULATION AGAIN BE USED. (K)