It is a bummer. What I do is find a duplicate plug for the transmission drain. Then swap the original with the duplicate. The bad bearing material or gear teeth will be attached to the magnet on the plug, if any. Check the oil that was lost to see if it contains suspended metal particles.
If the plug and oil show clean then maybe its the nature of the beast? My super 55 is pretty quiet in all gears.
Good luck! I know the feeling well.