Rams for trim and tilt will not retract fully w/ motor in upright and locked position. She will tilt and trim all the way down under the weight of the motor, Except for 1 episode last week while launching, pulled back to parking area and tried it again and she was fine. Fluid is full to the brim. I can hear the motor running normally, but rams will not retract into the cylinder. Any Thoughts?/// Thanks in advance.