A hot wooden spoon being used in a fleishig pan fell onto stovetop, is this a problem (is the stovetop considered treif if used for both meat and dairy?)
My understanding of your question is that it didn’t fall on to the grats under the pot, but on to the part between the grates. It would depend if the stovetop was clean at the time, and if there was milchig spills on it within the last 24 hours. If the stovetop was clean and didn’t have hot milchig spills on it in the last 24 hours, then it does not have to be kashered. However if the stovetop was not clean or if it had hot milchig spills on it within the last 24 hours. then it would need to be kashered. Wait until 24 hours after the spoon fell, clean it off well so that it is totally clean, then stick it into a pot of boiling water for a few seconds. Then rinse it off with cold water.