As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATIONAL TEST EMERGENCY EXIT LIGHT ON SEAT 1DC, 2DC , 3DC, 4DC AND 32FED AT PASSENGER CABIN WONT PASS TEST. PERFORMED TROUBLESHOOTING AS PER FIM 33-50-00-810-801. REMOVED AND REPLACED BATTERY PACK POSITION M1674 AND PERFORMED OPERATIONAL TEST GOOD.