grey water drain and fresh water drain?

[Sidekick]

Have just purchased a 2007 Gulfstream prairie schooner fifth wheel. It shows 2 grey water tanks on the monitor but have only found one drain beside the black water drain? Where is the other located. Also is there a drain for the fresh water holding tank. It is full of smelly water and I would like to drain and refill. Thx for any help. New to this and no manual. 🤪