The other day my trim tilt just stopped tilting when taking it back to the boat launch. I can hear the pump motor running when I press the buttons up or down but it don't move the engine. I checked the hoses for leaks and cleaned the unit for broken seals. I ran new oil but it doesn't seem to be pumping it all. I manually lifted the motor up and down a few times to get air out of it but I might have done it wrong? What are the proper ways to bleed this system? I have a few pictures of the unit.