As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: FWD ELT DOES NOT POWER ON DURING SELF TEST. MAINTENANCE REPLACED FWD PORTABLE ELT I.A.W. AMM DMC-B787-A-25-63-01-999-921A-A AND PERFORMED OPERATIONAL TEST OF PORTABLE EMERGENCY LOCATOR TRANSMITTER I.A.W. AMM DMC-B787-A-25-63-01-999-320A-A. OP'S CHECK GOOD.PARTS CHANGE INDICATED - TT # 1037769 SN OFF 24-2776.