Hello, I have a SLK320, have read many posts, trying to get rof to work. Went to raise roof one day and trunk opened and roof started to come up and stopped about halfway up. I figured pump was low. I raised roof manually and added oil to pump. Now I get flashing light in activation switch. When I push to close pump does run, but when I try to open switch flashes. It worked fine till I raised roof manually and added fluid. Any ideas?