As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS - UNARMED CAUTION LIGHT CAME ON IN FLT, EMERGENCY LIGHTS CAME ON IN CABIN. CYCLED SWITCH FROM OFF TO ARMED AND RESET C/B L7 AND L8 NEITHER WORKED. AIR RETURN TO MSP. MAINTENANCE CYCLED AC PWR EMERGENCY LIGHTS OPS CHECKS GOOD IAW SF340 MM CH33.