What was found
CABIN EMERGENCY LIGHTS AND DOOR EMERGENCY LIGHT FLICKERING WHILE IN FLIGHT AND DURING TAXI IN. CORRECTIVE ACTION: GAINED ACCESS TO THE AIRCRAFT NOTING THE EMER LIGHTS ARE OFF WITH THE SWITCH IN THE OFF POSITION, WITH THE SWITCH IN THE ARM POSITION AND POWER OFF, THE LIGHTS ILLUMINATED AND WERE FLICKERING. WITH THE SWITCH IN THE ON POSITION AND POWER OFF, THE LIGHTS REMAINED ON AND WOULD CONTINUE TO FLICKER. GAINED ACCESS TO THE #1 AND #2 EMERGENCY BATTERIES AS REQUIRED. PERFORMED GVI OF BOTH BATTERIES WITH NO OBVIOUS DEFECTS. PER FIM TASK 33-50-00-810-801-A, TECHS NOTED THAT WITH ONLY THE #1 EMERGENCY BATTERY CONNECTED, THE SYSTEM WOULD OPERATE AS REQUIRED. WHEN ONLY THE #2 EMERGENCY BATTERY IS CONNECTED, THE EMERGENCY LIGHTS WOULD STAY ILLUMINATED IN THE ARM POSITION AND START TO FLICKER, PER FIM TASK 33-50-00-810-801-A, #2 EMERGENCY BATTERY IS FOUND TO BE FAULTY. CONTACTED MCC WITH FINDINGS AND ADVISED REPLACING BOTH THE #1 AND #2 EMER BATTERIES AT THIS TIME. MCC PLACED REPLACEMENT EMERGENCY LIGHT BATTERIES (P/N 7450L5-00) ON ORDER. AWAITED PARTS, RECEIVED REPLACEMENT EMERGENCY LIGHT BATTERIES AND VERIFIED PAPERWORK. REMOVED FAULTY #1 EMERGENCY BATTERY P/N 74501.S-00 S/N 007607 AND INSTALLED REPAIRED EMERGENCY BATTERY P/N 7450LS-0.2 VN 005547 IAW PHENOM 300 MM 33-52-01. REMOVED FAULTY #2 EMERGENCY BATTERY P/N 74501.5-00 S/N 007613 AND INSTALLED REPAIRED EMERGENCY BATTERY P/N 7450L5-00 S/N 005595 PER PHENOM 300 MM 33-52-01. PERFORMED THE OPERATIONAL TEST OF THE EMERGENCY LIGHTS IAW PHENOM MM 33-52-01, WITH NO DEFECTS NOTED. CLOSED ALL ACCESS AS REQUIRED.