As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT FAILS STANDBY POWER TEST. STANDBY POWER LIGHT DOES NOT ILLUMINATE WHEN STANDBY POWER IS TURNED OFF, AC POWER REMAINS ON. [07-27-07] FAULTY STANDBY POWER RELAY AND STANDBY AC VOLTAGE SENSOR. REPLACED THE STANDBY POWER RELAY (R238) AND STANDBY AC VOLTAGE SENSOR (M562).