As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE: EICAS ADVISORY MESSAGE - EMER LT BATT FAULT-; (RESOLVED ON W/O: 1300462 TASKCARD: NR-00032 ) PERFORM TROUBLESHOOTING PER EMB-190 FIM 33-50-00-810-802-A AND REPLACE EMERGENCY LIGHT POWER UNIT ELPU#2 PER AMM 33-50-01-000-801-A, AMM 33-50-01-401-801-A.MDDR CLEARED.