What was found
CABIN EMERG LIGHT: FRONT HALF OF EMERGENCY LIGHTS IN THE CABIN NOT WORKING THE EXIT LIGHT, FLOOR LIGHTS IN, OVERHEAD LIGHTS ON INITIAL PREFLIGHT. AFTER COLD SOKE PROCEDURE TR 21-04 APU RAN GOR 30 MINUTES LIGHTS CAME ON BRIEFLY FOR LESS THAN 20 SECONDS AND THEN WENT OUT THE EXIT LIGHT FLOOR LIGHTS. THE OVERHEAD LIGHTS WERE VERY DUMB // SIGNOFF// COMPLIED WITH TC-5XL-33-191202 (CE560XLS EMERGENCY LIGHTING BATTERY PACK REPLACEMENT - POST INSTALLATION TASKS IAW NETJETS TC-5XL-33-191202 DATED 1/29/2020.