Follow -up. We tried various things to identify the problem or fix it and no joy. eg, it was not low battery, we redid the brakes setting to see if it was that, etc.
One thing he added to the story is when he first drove forward to park it again the system did work at first and he got the front jacks down which raised the MH front end but the rear jacks did not come down. (all the way?) He got the front jacks back up, he can't remember how in all the fuss that went on, but the rear jacks remained partly down.
The rear jacks were still partly down today. So he raised them manually with the T handles and we hoped now everything would work. Nope.
Anyway over to him now. He has called the company and might also get a local RV tech on it. At least now thanks to Doug here and the others, he has some idea what to expect from the techs he talks to.
Thanks for the help guys, all in a good cause.