As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OAK - DURING ENGINE RUN-UP AT 15K CHECK, WHEN THE GENERATOR WAS DROPPED OFF LINE, THE EXTERIOR OVERWING EMERGENCY LIGHTS ILLUMINATED WITH THE EMERGENCY LIGHT SWITCH IN THE OFF POSITION. REPLACED THE POWER SUPPLY AND RELAY R2-271 AND OPERATED NORMALLY. REFERENCE ASAA9680139.