Dishwasher is not fully draining? do i need a

without knowing your model, most times you do not need a repair man
or a plumber, your diagnosis leads me to believe that you may have a clogged drain or sump
if you open up the bottom motor area, you should be able to access the sump area and clear the drain area.....
if your interested, you can look up the break down for your model on
www.appliancepartspros.com
just type in your model number look in the motror pump section

hope this help
but you can do it your self,,, its probably just needs to be clean