What was found
DURING FLIGHT 3328, LT INTAKE HEAT INOPERATIVE. AIR RETURN TO MSP. MAINTENANCE REPLACED LT LOWER DUCT P/N NH24668-165, S/N OFF - L180866, S/N ON - L211754. OPS CHECK GOOD IAW JOB CARD 7160-301. REPLACED DEICE CONTROL MOD P/N 44730-501, S/N OFF - A00012, S/N ON - A00162. ALL CHECKS GOOD IAW CHP 30. REFER TO 409 NR 071419 FOR DETAILS.