Mark,
Manual (see Coach Assist) shows a 15a fuse feeding the controller. Possible you have a failed relay feeding pump power. Check your Elec Bay Layout diagram for location. 03 Marquis shows K12 but probably different on Monterey. Possible that fluid is low and it is trying to extend jack(s) but not enough fluid to do it. However, you should get a low fluid alarm in this case.
Steve