Hi, thanks for the advice. Fixed her this morning. It was the little one inch hose identified in the chat SCVJeff provided about this issue last year. The pictures really helped. Took about 30 seconds to fix.
I removed the green vacuum line connected to the bottom of the do-hickey (in the pictures), pulled the 1 inch rubber tube (cracked just like in the pictures)and little metal elbow off. Then connected the little rubber elbow at the end of the green tube to the bottom of the do-hickey. Gave her a try and the pump stopped after building vacuum just like is was suppose to.
Btw, here's something interesting... I originally called Winnebago Tech Support about this. They said it was an air-horn compressor pump problem. Those guys should start reading this forum.