As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND EICAS MSG ADVISORY EMERGENCY LIGHT BATTERY FAULT. "TRANSFERRED TO NRWC 772-ORD-01511" RAR EMERGENCY LIGHT POWER UNIT #1 ,#2. #3 AND #4 IAW ERJ 170 AMM 33-50-01. OPS CHECK GOOD. REF NRWC 772-ORD-01511 FOR ADDITIONAL WORK PERFORMED AND PARTS ON/OFF