As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT INTAKE HEAT LIGHT ON. AIR TURNBACK TO MSP. MAINTENANCE COMPLETED VISUAL INSPECTION OF HEATER ELEMENTS. NO DEFECTS NOTED. COMPLETED CIRCUIT RESISTANCE CHECK OF HEATER ELEMENT, FOUND NORMAL THERMISTOR SHOWING SLIGHTCONTINUITY TO GROUND. SWAPPED TO SPARE POSITION. COMPLETED OPS CHECK OF LT INLET HEAT RAN FOR 25 MINUTES. NO FAULTS NOTED. OPS CHECK GOOD.