As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB AT FL 200, EMERGENCY LIGHTS ON STATUS MSG DISPLAYED ON EICAS. F/A REPORTS ALL EMERGENCY LIGHT ON LT SIDE OF CABIN ON RT SIDE LIGHT OFF. LIGHT WENT OFF AT 18,000 IN DESCENT. EICAS MSG CAME BACK ON WHILE AT THE GATE AFTER SHUTDOWN. REPLACED NR3 BATT PACK AND CHARGER ASSY. BATT PN ON/OFF 2013-1A, SN OFF 105908, SN ON 100407. CHARGER PN ON/OFF 11-0049, SN OFF 23214, SN ON 22993 IAW AMM 33-51-05 AND OPS CHECK GOOD. REF AMM 33-51-04.