As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 12 MONTH CERTIFICATION OF ELT THE UNIT WAS INSPECTED AND FOUND THE BATTERIES LEAKING AND BATTERY CONTACTS ON THE ELT BATTERY CASE CORRODED. BATTERIES HAD A DATE CODE OF MAR 2010 AND MAR 2009. BATTERIES AND BATTERY CASE REPLACED AND UNITTESTED SEVICEABLE.