As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS OVER AISLE ROWS 3+5 NOT ILLUMINATING. REMOVED FROM SERVICE. R+R FWD LH EMERGENCY LIGHT POWER UNIT BATTERY REF. E175 AMM TASK 33-50-01-000-802-A & 33-50-01-400-802-A. OPS TEST GOOD. NO FURTHER DEFECT. AIRCRAFT RETURNED TO SERVICE.