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Check around the base of the tail..If the gland is blocked it may be swollen or discoloured. I havent ever had a duck with a blocked gland so dont have pics - but you can do a google search for pictures to know what to look for..

You can check the oil gland for blockage or to make sure it is actually producing oil. Muscovies tend to have less active glands than other ducks- also just before they molt when the feathers are old and getting a little ragged-they are harder to keep waterproofed. How old is he??