Strange Tenant request to repair dishwasher

[Ali BenAyed]

Hello, 

This tenant request to repair dishwasher is strange to me, and I need more opinions about this. Backstory: I lived in this house more than 2 years and I used to use the dishwasher almost everyday with no problem. 
the tenant text “Hi Ali! We have a bit of plumping issue or something going wrong. I’m not entirely sure. We never use the dishwasher. We always handwash our dishes and use the drying rack because the dishwasher never thoroughly washed the dishes when I originally moved in. Plus i prefer hand washing. When we got home this evening from work and daily activities we smelled this awful odor coming from the kitchen. We inspected and come to find out it was water piling up in the dishwasher. Angelica [the girlfriend] said that perhaps it could be the garbage disposable pipe? This water looked like it has been piling up for awhile. Could you have a plumper come out and look at it sometime over the weekend? Or early next week?”