I have a 2004 damon intruder class A I bought new.
last year I was in Grand Canyon and when we tried to retract they would not go up. I had been having the low jack senors trigger prior but not sure related. At this point it was like I had zero power to the system, not lights or anything.
Anyway, I had to unhook fluid lines to drain out fluid to retract.
Went on to lake havasu and did not try the jacks as site was level. However when I was putting my lawn chairs back into the mid-coach storage bay pass through when heading home, I noticed a box attached to the ceiling of that basement storage bay. I crawled in and a wire was pulled out. Then noticed the box had same branding as the jack system. This evidently was the auto leveling box (mid coach/center in bay) and I plugged back in the lose wire and turned on the system and all my power was back.
I must have pulled out the wire in Grand Canyon and didn't notice.
I have owned the RV for 12 years and put chairs in/out and never had the issue or knew this could happen.
May not be your issue but it was a cheap fix