What was found
AVIONIC SMOKE INDICATION DURING FLIGHT HALFWAY BETWEEN RFD & DBQ. ORH COMPLETED, DECLARED AN EMERENCY AND LANDED RFD. DBQ FOGGED IN, WARNING INDICATION PERSISTED. NO SMOKE INDICATED. MX REPLACED AVIONICS SMOKE DETECTOR, OPS CHECK GOOD, REINSTALED PANEL 220AZ, REMOVED FROM DMR.