Rinse dispenser stopped dispensing rinse agent

about 2 months ago, the rinse dispenser stopped dispensing the rinse agent so now I am getting a film on glasses and stainless steel silverware, probably every thing else, but doesn’t show like the above items. I was told there is a bio-metal part that needs to be replaced after taking the cover off of the door. Is this true and how do I know what to look for so I can do it. I will need to order the part and that doesn’t sound like much to go on. A Sears repair man told me that. Appreciate any help. Thanks.
rkirby9905@msn.com

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The given Model Number comes up as a Trash Compactor

Here is a link that should help
http://www.applianceaid.com/dish.html

Check out #23 for the Kenmore