As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 2919 LEFT LP BLEED VALVE WOULD NOT STAY OPEN MORE THAN 2 MINUTES IN EITHER MANUAL OR AIR TURNBACK TO MSP. MAINTENANCE TROUBLESHOT, FOUND RIGHT DUCT OVERTEMP IN AUTO AND DUCT OVERTEMP LIGHT NOT ILLUMINATING. REPLACED DUCT TEMP SWITCHES M2035-501. OVERTEMP AND MCP LIGHT NOT ILLUMINATED.