As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING: WITH NO AC POWER APPLIED TO THE AIRCRAFT, WHEN EMER LIGHT SWITCH PLACED TO ARM NO EMER LIGHT COME ON. WHEN EMER LIGHT SWITCH MOVED TO ON WITH NO AC POWER APPLIED ALL EMER LIGHT WORK NORMALLY. CORRECTIVE ACTION: REPLACED BATTERY. OPS CHECK GOOD. IAW CE680A AMM 33-50-10