As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEVERAL INTERNAL AND EXTERNAL EMERGENCY LIGHTS INOP.<[01] TROUBLESHOT TO FUALTY EMERGENCY LIGHTS POWER SUPPLY BATTERY PACKS AT POSITIONS M1670 AND M1674; REMOVED AND REPLACED BATTERY PACKS M1670 AND <BR>M1674; OPS CHECK NORMAL REF B737 AMM 33-51-06 AND 33-51-00;[02] VERIFIED STEP 1