As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ORIGINATING TEST OF PASSENGER EMERGENCY LIGHTS ONLY BACK 3/6 LIGHTS LIT UP ON CEILING. REMOVED FROM SERVICE. CYCLED A/C POWER PERFORMED OPS CHECK IAW E175 AMM 33-50-00-710-801-A EMERGENCY LIGHTS CHECK GOOD. NO OTHER DEFECTS NOTED. RETURNED TO SERVICE.