As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 2968 LT ENGINE INTAKE HEAT (LT INTAKE) LIGHT CYCLES ABOUT EVERY 30 SECONDS TO A MINUTE IN FLIGHT. AS FLIGHT PROGRESSED LIGHT CAME ON EVERY 5 MINUTES. AIR RETURN TO DTW. MAINTENANCE CHECKED RES OF DUCTS, ALL GOOD, CHECKED RES AT THERMISTOR FOUND J1 HIGH. SWAPPED J1 WITH J5. OPS CHECK GOOD IAW SF340 MM 3020.