Haste makes waste!
If you had posted the problem here before running to Lowe's you would have been advised that if your machine fills and drains, then the pump is fine, the timer is fine and all that is wrong is your lower wash arm support is most likely worn out and needs to be replaced.
New racks are available.I have at least 2 of them in my attic as well as possibly a good used support. You might have gotten another 10-20 years out of it which is not unheard of! In fact, if it happens to be a KDP18, I even have a spare timer that one of the other members sent me to sell if someone needed it.
It is not too late to save it and possibly use as a spare machine in your garage or pantry or basement when you have an over abundance of dishes to be done and can't wait 3 hours for the new machine to was a load of dishes.