RRitt. I have 1990 Force outboard 1208X90C. Tilt & trim unit is leaking down. I have been told the pump & motor assy 853515A1 is leaking down and replacement is no longer available. I recently purchased a used complete tilt & trim unit and installed it. The used unit has the same problem. Now I have 2 complete tilt & trim units. I have been to several repair shops and they say no parts are available. I can't find anywhere to rebuild pump and motor assy or the complete units. Do you rebuild the pump & motor assy? Or do you rebuild the complete units? Thanks