The switch on your jack is a "reversing polarity switch" which means that when you push the switch in one direction it applies +DC power to the jack motor and when you push the switch in the opposite direction it applies -DC power to the jack motor. Apparently either the switch is defective, the "retract" connector came loose or when they washed it they got it wet and it's shorted out. It may work when it dries out, it may not.
As for the locks, try some "lock deicer" to spray into the key slot. That should thaw and displace any water in the locks. (hopefully).....
It's not a good idea to wash any vehicle when it's below freezing. What you're experiencing is just a sample of some of the things that can go wrong. I've seen slide seals ripped off the slide, doors jerked so hard to open them that they literally broke into pieces and windows that won't open, are forced to open and shatter when they flex. That's just a few of the problems with frozen, wet RV's.
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS