I bought my boat at auction and the tim tabs did not work. I checked the fluid and it was out so added fluid but they still do not work. The motor runs but the trim tabs do not move down, if I push the button for the tabs to come up the motor slows under pressure. Do I need to bleed the lines ? I see the fittings and lines in the stern compartment, do I loosen the fittings and run the pump to get the air out of the lines? Will this take care of my problem?