hynautic steering ram is leaking

[iluvteak]

I have a leak at the ram mounted near my rudder on a 36 Morgan sailboat. I did add about a quart to the resevoir a few months back and am wondering if that is the issue. I used auto transmission fluid Dex III/M on a recommendation of a neighbor boat.

Could this be too thin a fluid and leaking thru the O ring seals on the ram ? Should I drain the system and use hynautics recommended fluid?

Anyone ever rebuilt the ram? I was quoted $600 for a local shop - seemed outrageous.

Thanks