As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED ELT FUNCTIONAL CHECK, THERE WAS NO DOWNWARD SWEEPING TONE. DURING THE TROUBLESHOOTING OF THE ELT, IT WAS FOUND THAT THE BATTERY PACK WAS AT 6.8 VOLTS. (SUPPOSED TO BE 9 VOLTS). THE REPLACE ON/OR BEFORE DATE IS FEB '97. DATE OF INSTALL WAS JAN '95.