As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TESTING THE ELT ON ITS ANNUAL CERTIFICATION IAW CAR 571 APPENDIX G FOUND NO OUTPUT DUE TO FAILURE OF BATTERY PACK. BATTERY PACK REPLACED AND UNIT TESTED IAW CAR 571 APPENDIX G. ELT RETURNED TO SERVICE. THE FAILED BATTERY PACK WAS 1 YEAR OLD AND NOT DUE FOR REPLACEMENT UNTIL AUG 2021.