As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS INOP<[01] PERFORMED TROUBLESHOOTING OF EMERGENCY EXIT LIGHTS CIRCUITS. FOUND DEFECTIVE BATTERY PACKS PER REF B737 SSM 33-51-12; 33-51-13; 33-51-14. REPLACED BATTERY PACKS M1674; M1675; M1669 AND M1672. PER REF AMM 33-51-06-960-805. PERFORMED EMERGENCY LIGHTS OPERATIONAL TEST PER REF AMM 33-51-00-710-801 TEST PASSED.;[02] VERIFIED STEP # 1 VERIFIED TESTING OK