Tenants dishwasher runs 8 rinse cycles, light won't turn off.

I am having issues with one of my tenants’ dishwasher. The light won't turn off after it's done, like it should. It's running 8 rinse cycles, and after a bit of research I'm more indecisive of how to fix it. I thought, maybe it was the main computer board, but now not so sure. Does anyone know what the problem is? GE model: GLD4550N10CS