As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)DURING ELT RECERTIFICATION CHECK A POWDERED DUST NOTICED ON CASE. UNIT FAILED TO ACTIVATE WHEN TURNED ON OR IN ARMED POSITION. ALL BATTERIES FOUND CHAFED, TWO WERE CORRODED, AND SEVERAL HAD LOW VOLTAG E. SUBMITTER SUGGESTS CAUSE IS RESULT OF USE IN HELICOPTER WITH HIGHER VIBRATIONS. BATTERIES WERE MANUFACTURED BY DURACELL.