After spending $600 for rebuilt tilt/trim motor and starter motor installation, tilt is semi-responsive. Shop said they cannot locate problem. Engine has "stuck" in the down position, and yes of course when I am ready to come out of the water, two times now. Shop has the boat, 2.5 weeks again and cannot isolate the problem. HELP! It's 100 degrees already and I want to get out on the lake!