To me, it looks like someone used bronze/brass fittings screwed into a painted aluminum part. The corrosion can be cleaned up, remove all of the paint on the corroded part and replace the bronze/brass fittings with satinless, using a thread dope or teflon tape for fuel (not white) to insulate the threads enough that they won’t gall. Also, that heim joint has failed or the lever arm needs to be bushed (looks like both to me). Try just tightening the leaking fittings, that may solve the leak.
I also do not see any bonding on that rudder stock, you might investigate that more too?
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