I thought I’d be posting every day but got sidetracked with replacing the sewage outlet pipe which required digging a ditch the entire length of the back yard.
The incorrect pipe was used when the original pipe was replaced and there were bellies down the entire pipe which caused the wastewater to pool in the middle instead of draining away.
The correct pipe is now installed and graded for optimum drainage and this will hopefully never have to be done again.