The pump has been replaced. While that seems easy enough to do, the location made it anything but. However, I was able to get the job done without breaking anything, or drawing any blood.
Now the important part. I opened the cold bathroom sink faucet, turned on the pump, and water began to flow in less than 5 seconds. So, yes the problem was a failed diaphragm.
Thanks for all the help in trouble shooting the problem. I'll report back on whether or not the Mfg, will honor the 2 year warranty. My coachmen warranty expired last August.
2017 Coachman Chaparral 334TSIK
2015 F350 PS