As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT NR 3196, LEFT DUCT OVER TEMP LIGHT ON AND BLEED CLOSES. WHENEVER BLEED IS RESET THE DUCT TEMP GOES UP ALL THE WAY. HAPPENS IN AUTO AND MANUAL MODES. AIR RETURN TO MSP. MAINTENANCE REPLACED LEFT DUAL TEMP CONTROL VALVE IAW SAAB AMM 21-61-05. ALL CHECKS GOOD.