904 Leaking. What to check first?

Middle pic shows selector shaft seal leaking. Fluid flows down from there to NSS and pan rail and floor. Carquest/Warever brand part cleaner is least expensive most of the time. Wash it all good and pin point the leak. When a metal line or fitting has a bulge for clamp to sit behind, 1 clamp. Smooth pipe should get 2 clamps. Longer piece of hose covering more of the pipe would help. There isn't a lot of pressure there. If the clamps are tight it shouldn't leak. You might could replace hose and clamps with a compression union rather than replace the entire line.
I dropped pan and valve body of my 904 and replaced selector shaft seal. Less than 90 days later the front seal started leaking. Should have known. They are all the same age after all. Good luck with yours.