What was found
EMERGENCY BUSS OFF LIGHT ILLUMINATED IN FLIGHT. RETURNED TO PDX. REPLACED BACK UP BATTERY IAW MM CHP 24. OPS CHECK GOOD. SN ON 10023, SN OFF 8772.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
EMERGENCY BUSS OFF LIGHT ILLUMINATED IN FLIGHT. RETURNED TO PDX. REPLACED BACK UP BATTERY IAW MM CHP 24. OPS CHECK GOOD. SN ON 10023, SN OFF 8772.