As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS INOP AT POSITIONS: 6 ABC; 8 DEF; 9 ABC; 12 ABC; 12 DEF AND R2 DOOR; UPPER EMERGENCY EXIT LIGHT. / [01] DURING TROUBLESHOOTING FOUND BATTERY PACK POS. M2335 DEFECTIVE AS PER REF. B737 AMM 33-51-00-710-801.;[02] REMOVED AND REPLACED EMERGENCY BATTERY UNIT M2335 AND PERFORMED TEST OF THE EMERGENCY LIGHTS. OPS CHECK NORMAL<BR>REF B737 AMM 33-51-06-960-805 AND 33-51-00-720-801;[03] VERIFIED STEP 2