I have 10 ft blades, CM 1.0, with the black/blue 5/16 hydraulic tubing. One of my power poles is slowly lowering when hitting bumps and waves. I've raised and lowerd it a bunch of times to see if it needed to be bled. That didn't help. After raising it all the way, I can grab the pole and shake it applying pressure and feel it slowing loosening up. I see no leaks anywhere. No fluid. I've checked everywhere I can think of. I made sure fittings were all tight. There's no fluid around the compression fittings or anything. Fluid is clean and at the right level. Both pumps are fairly new replaced last fall. Is there anything besides a leak that might cause this? Thanks in advance.