As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SVC FOUND WHITE EMERGENCY LIGHTS ABOVE SEAT ROWS 29DEF AND 32DEF NOT ILLUMINATING. REMOVED BATTERY PACK FOR ROWS 29DEF - 32DEF PER AMM 33-51 THRU STEP E.(5)(B). INSTALLED NEW BATTERY PACK PER AMM 33-51 THRU STEPS E(6) TO F(6). OPS CHKD GOOD. (LOG 8904542 - AIRCRAFT WAS GROUNDED).