If your frontload washer leaks, and you can’t see where its coming from, then there are a few things to check. Different hoses may tear, allowing water to leak while operating. The water inlet valves fail due to corrosion, resulting in a slow drip. The water pump might have a crack or hole. If your outer tub has cracked, it is not worth the repair for this model WM2016CW or other older models like this.
Here are 3 links for the most likely culprits on this model. Make sure none of the rubber hoses have torn.
cold water inlet valve- $33
hot water inlet valve- $17
drain pump – $78