What was found
DTW - FLT 1220 - AFTER TAKEOFF ORD EN ROUTE ROC, THE AURAL WARNING FOR LANDING GEAR COULD NOT BE SILENCED. RETURNED AND LANDED ORD WITHOUT INCIDENT. REPLACED R2-295, PROXIMITY SWITCH UNIT. PRECAUTIONARY REPLACED AURAL WARNING UNIT. THROTTLE SWITCHES NORMAL. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)