I have a 2006 Yamaha f115. Since the engine was new I have had trouble with tilt-noise, sounds like air in the fluid. Last autumn the tilt stopped working totally (no effect on the trim-pins, though the tilt-engine worked fine). I had it in for service, and they changed the square engine-part on the left side of the the trim-cylinders. Now it works again, but the air-noise is worse than ever. I have tried to bleed out the air by manually rise and lower the engine. When I do so I can hear the air "surkle", but it wont disappear. I'm afraid that the trim will stop working again after some hours of use. How do I get rid of the air - the dump system should be self-bleeding, but this seems to failure. (Excuse my English).