What was found
LEFT ENGINE INTAKE HEAT LIGHT CAME ON IN FLIGHT. AIRCRAFT RETURNED TO DTW. MAINTENANCE SWAPPED TEMP SENSOR ON SHOE BOX T2 INTO T4, T3 INTO T5, REMOVED CANNON PLUG ON LOWER INLET AND FOUND OIL AND MOISTURE. CLEANED AND RESECURED. OPS CHECK GOOD, RAN ENGINE FOR 15 MINUTES.