904 Tranny question

One tip is to fix the highest leaks first. Fix the Speedo seals first and check it. then The Pan Gasket and probably put a filter kit in it. If it still leaks but you can only see it from the bell housing then it's probably the Pump seal. That will require pulling the Trans out. Refrain from driving it while it's low on fluid or you may end up needing to rebuild it.
I vote to go the other way around. If you have a torque converter seal leaking, the transmission has to come out anyway so why mess with the other leaks. Pull it out and do a full reseal and be done with it. If it's not leaking at the converter seal, then yeah, repair the ones that are. You may have to clean everything up first so you can see exactly where the fresh oil is coming from.