What was found
LAV EMERG LIGHT: THE LAV RED EMERGENCY LIGHT, FLOOR KICK PLATE LIGHT, AND READING LIGHT WILL NOT ILLUMINATE. ALSO, THE OTHER EMERGENCY LIGHTS WILL ONLY ILLUMINATE WITH THE EMER SWITCH TO ON. WHEN THE SWITH IS ARMED, NONE OF THE LIGHTS ILLUMINATE. WE CHARGED THE BATTERIES TWICE AS PER THE BATTERY CHARGING PROCEDURE. CORRECTIVE ACTION; REMOVED AND REPLACED #4 EMER LIGHTS BATTERY DUE TO NO OUTPUT. INSTALLED REPAIRED UNIT IAW CE680A AMM 33-50-06. OPS CHECKS COMPLETED WITH NO DEFECTS NOTED.