Had the same problem after my coach was in for service. Both seats wouldn't move.
I discovered they turned off the "Salesman switch" which turned off the house batteries.
On my coach the house batteries provide power to my driver and passenger seats.
2004 Monaco La Palma 36DBD
Workhorse W22 8.1 Gas Allison 1000, 7.1 mpg
2000 LEXUS RX300 FWD 22MPG 4020 LBS
US Gear Brakes