As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PLACED IN THE "ON" POSITION, THE EMER LTS SWITCH IS INOP. WHEN PLACED IN THE "OFF" OR "ARMED" POSITION THE SWITCH AND LIGHTS FUNCTION NORMALLY. CORRECTIVE ACTION: INSTALLED NEW TOGGLE SWITCH. P/N A3-201-01A. PERFORMED EMERGENCY LIGHTING OPERATIONAL CHECKS, ALL CHECKS GOOD. IAW CE-680 AMM 31-10-20 & SPM 20-30-30.