What was found
DURING ORIGINATING FLOW CHECKS, EMERGENCY LIGHT COCKPIT, R1 DOOR AND FORWARD EXIT SIGN FLASH INSTEAD OF REMAIN ON STEADY DURING TEST. ALSO EICAS CYAN EMERR LT BATT FAULT. REMOVED FROM SERVICE. F.C. 33500001UT1 "EMER LT BATT FAULT" FWD R/H IN CMC. REF E175 FIM TASK 33-50-00-810-801-A STEPS 1-7.L.ON WING EMER LT PWR UNIT BATT (FULL CHARGE) & SYSTEM RESETS NO HELP. R&R EMER LT PWR UNIT BATT #1/ FWD RH REF E175 AMM TASKS 33-50-01-000/400-802-A. ALL OPS TESTS ARE GOOD. EMER LT TESTS NOW NORMAL. NO EICAS OR MAINT MESSAGES. NO FURTHER ACTION REQUIRED. AIRCRAFT RETURNED TO SERVICE.