Mysterious. At times, pungent. Always annoying. It seems to be coming from the clothes chute, permeating the upstairs. But no one can identify the source! It isn't mildew. It isn't ripe clothing waiting to be processed. Have no idea what it is. Will see what our carpenter thinks. The furnace/ac man was perplexed. But a mystery has a solution, and we will find it...eventually. Until then, we ponder...and you? You are loved!