What was found
CABIN EMERG LIGHT: IN THE ARM POSITION ALL CABIN EMERGENCY LIGHTS WERE FLICKERING ON AND OFF DURING FLIGHT. ATTEMPTED A RESET BY TURNING THE LIGHTS OFF THEN BACK TO ARM. THE EMERGENCY LIGHTS STAYED ON IN THE ARM POSITION FOR ABOUT 30 SECONDS AND THEN STARTED TO STROBE ON AND OFF.// SIGNOFF// CONFIRMED DISCREPANCY. GAINED ACCESS TO #1 AND #2 EMER BATT PACKS. REMOVED #1 EMERGENCY BATTERY P/N 6450LS-00 S/N 002251 DUE TO INTERNAL FAILURE. INSTALLED NEW EMERGENCY BATTERY P/N 7450LS-00 S/N 005279 AS REQUIRED. REMOVED #2 EMERGENCY BATTERY P/N 6450LS-00 S/N 002247 DUE TO INTERNAL FAILURE. INSTALLED NEW EMERGENCY BATTERY P/N 7450LS-00 S/N 005269 AS REQUIRED. CHARGED EMERGENCY BATTERY AS REQUIRED. PREFORMED AND FOUND OPERATIONAL TEST SATISFACTORY. WORK DONE IAW EMB-505 AMM 33-52-01 & 33-52-00. 18JUL2021