Neptune fl softener dispenser
 

Softener dispenser is not releasing softener. I have removed and thoroughly cleaned dispenser and inside where it sits. When I open the dispenser drawer to add detergent for the next load, that's when the softener releases and drains into washer (before I turn on the cycle). I am handy and can likely change put a part. Only my manual does not tell how schematic nor tell me what the parts are. Any ideas?