Newbie question regarding draining the cold and hot water systems

 I am not going to be using my  2016 T@B 320 s for about six weeks so I drained the fresh water tank and the hot and cold water system. I think I found all of the drains (fresh water valve and drain in front of the tire under the door, hot and cold drain valves to the right of the Alde unit with drains directly through the floor emptying under the trailer, and the Alde pressure relief valve next to the Alde and emptying directly through the floor) but one of the manuals I have read says that there is an Alde drain also. I have not found that drain.

Is there a drain from the Alde?

Thanks