I think I know the dishwasher you're talking about. had one and liked it (with the low tines on the sides--very convenient for cookie sheets etc).
I, 1 year ago, had really good luck contacting Frigidaire recently--a newer (1996) dishwasher. I commented on it here. I can't remember the sequence of events, but couldn't find an exploded diagram of the specific dishwasher. Got in contact with a product manager at their dishwasher plant in Kinston North Carolina who, as I recall, had come from the D&M organization. He sent me the diagram within about 10 minutes and I was able to get things resolved.