As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S GYRO FLAG APPEARED AFTER TAKEOFF. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED CAPTAIN'S ATTITUDE DIRECTIONAL INDICATOR WITH NO HELP. REPLACED INSTRUMENT AMPLIFIER. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO GATE.