The other day when I was pulling my 2yr old snomo trailer from storage, I hit the trailer brakes from the controller to test them before getting on the road and seen the rt side wheels lock up(gravel lot) and the left side didn't seem to be working. I could also tell when driving that they don't seem to working as well as they should. Can anyone point me to where I should start looking first? Could a bad ground cause just one side to not work? The wire harness runs inside the trailer in that black flexible sheathing except for the ground running from each wheel to the frame. Or is it likely froze up from sitting? I've never serviced elec brakes before so any advice would help.