My right trim tab fluid is milky, and I'm not sure where to look for the leak. Yesterday we changed out a solenoid, and I tried to empty all of the bad fluid. We emptied the reservoir and cleaned it with solvent. We then ran the pump with the lines disconnected to force all of the bad fluid out of the lines and cylinder. After putting it all back together and bleeding the system (running the tab up and down several times), it looked great. After an hour on the water, it looked like strawberry quick! What would be the most likely place that water could enter the system? Where and how do I start to look for the leak?

the leak you have is from the tab cylinder. if it is not that bad probily leaking from the shaft seals on the cylinder.

Can you just replace the O-Rings, or does it have to be completely replaced?

you will not know until you take the ram apart and look at its condition.

Did you ever solve this issue? If so, what was it? I have the same problem. Thank you