As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY PATH LIGHTING WILL NOT ILLUMINATE BETWEEN G7 GALLEY & SEAT 4AB.L WHILE TROUBLESHOOTING DISCOVERED BATTERY PACK PN D717-01-100 SN 42773 TO BE BAD. INSTALLED BATTERY PACK PN D717-01-100 SN 151051 IAW AMM 33-51-06 & OPERATIONS CHECKED GOOD IAW AMM 33-51-00.