As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE LT INTAKE HEAT LIGHT ILLUMINATED INFLIGHT. AIR RETURN TO MSP. MAINTENANCE PERFORMED OHMS CHECKS OF LT INTAKE HEAT ONLY FAULT HAS HIGH READINGS ON TEST BOX PINS G TO E AND E TO M FOUND PROBLEM TO BE DEICE MODULE REMOVED AND REPLACED DEICE MODULE PN 44730-501 SN OFF A00632 SN ON A00301 IAW ATC MM 30-21-03 OPS CHECKS GOOD.