Went out this morning and managed to find a large rock in the middle of the lake. I was only going at idle speed, but now my tilt and trim will not work at all. I pulled the screw out to check the fluid after I got back on the trailer, and it was air and watery. Drained and refilled, and after trying to get the motor to lift for about 15 seconds, more air. Any ideas what this could be or how to fix it? The boat guy in town wants $300 for a 30 year old part that matches mine. If nothing else I'll carry a slotted screw driver with me and just not have tilt/trim