What was found
EMERGENCY LIGHTS AT SEAT 5 (FLOOR), SEAT 8 (FLOOR), SEAT 7 READING, AND EXTERIOR OVERWING EXIT ARE INOP. CONTACTED MX AND ADVISED TO COMPLY WITH "EMERGENCY LIGHTS FAIL PREFLIGHT TEST". WE COMPLIED WITH THE FULL TEST--(2) 30-MINUTE CHARGING CYCLES AND THE ABOVE LIGHTS REMAIN INOP. REMOVED NO. 8 SEAT TO GAIN ACCESS TO FAULTY NO. 3 BATTERY PACK. REMOVED AND REPLACED #3 EMERGENCY BATTERY PACK WITH REPAIRED UNIT. OPS CHECK GOOD AT THIS TIME. INSTALLED NO. 8 SEAT, SEAT CUSHION AND SHROUD. WORK ACCOMPLISHED IAW CESSNA CE-680A AMM CH 33-50-06, AMM CH 33-50-00 AND CESSNA CE-680A IMM CH 25-20-22. OPS CHECK GOOD AT THIS TIME.