As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: THE CABIN EMERGENCY LIGHTS ACROSS THE MAIN CABIN DOOR DO NOT COME ON. THE OTHER CABIN EMERG LIGHTS COME ON FOR LESS THAN 30 SECONDS. REMOVED DEFECTIVE EMERGENCY LIGHTING POWER SUPPLY BATTERY P/N: CBS28-1 S/N: 0465M (POS: 1) AND INSTALLED AN REPAIRED UNIT P/N: CBS28·1 S/N: 006209 IAW CESSNA MODEL 680A MM 33-50-06. OPS CHECK GDOD