As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING WORK CARD 72T00052001 FOUND EPAS BACKUP BATTERY FAIL DURING TEST STEP 2.B.(5)(J) AND NO LED ON WHEN PTT PRESSED ON EPAS. MAINTENANCE REPLACED IAW AMM 52-12-24 RIGHT OVER WING ESCAPE SYSTEM BACKUP BATTERY PACK.