After being hooked up to city water for awhile, I discovered that the fresh water tank was overflowing. From previous posts, this points to a bad check valve in the pump. Flojet, ITT, confirms that a faulty check valve will cause my symptoms.
I replaced the pump and no longer have any of my problems. I also ordered a check valve repair kit and now have a spare water pump. Once you have the water pump in your hands, it is about a 10 minute job to replace the check valve assembly.
Thanks to all for your help.
Pete - Full Timing
2000 Country Coach Magna 40', CAT C10, #5892
2006 Jeep Liberty