Parking sensors??

My parking sensor system is showing a malfunction so I brought it in to dealership today. Just found out the previous owner had a fender bender and the truck had rear bumper damage so I guess two of the sensors are damaged. The rear of the truck looks fine so there obviously was a repair done. Does anyone have a couple sensors they want to get rid of? Or should I just order from Roman. The dealership wanted to charge me $120 to further diagnose the issue but I passed because it’s evident to me what’s wrong.

 

They sold it as CPO I’m sure? So they should cover that under warranty.

 

I bought the truck from a private seller so no cpo. I guess if this is the worst news I get about it I’ll take it.