As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3487, A/C HAD LEFT ZONE HIGH TEMP IN (SYSTEM BLEED LEAK). A/C NEEDED ICING CAPABILITY TO LAND IN STL. DISPATCH RETURNED A/C TO MSP. AIR TURNBACK. MAINTENANCE FOUND DOLLS-EYE INDICATOR TRIPPED FOR NR 1 PYLON. REPLACED SEALS P/N 303200 FOR TEMP SENSOR AND DUCT SLEEVE. LEAK CHECK GOOD DURING GROUND RUN.