Its a Bosch dishwasher and its about 5 years old, its been leaving water in the bottom after cycles and it's getting gross and smelly between the times I use it. When I run a cycle, I can hear the pump working, or at least I think I can. It makes the normal swooshing sounds but after I see standing water. My husband wants to just call a repair guy but those service calls are expensive and half the time they just clean the filter and charge you $150. He's pretty handy with basic repairs and I get that he may not want the stress but I just want to know if its something we can potentially handle or if we'd have to surrender to the powers that be