Soap dispenser door won’t stay closed. I have cleaned the latch with vinegar and it appears clean.
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=mdbh969aws1
Unplug or flip the breaker to the unit. Now try to close it. This ensures that the control board is not powering the door opener on all the time.
If it will not close then I would replace the dispenser (Item 8 in Section 3)