If u are getting water intrusion on a hose, without submerging the prop shaft or oil port & drain, i d say water pump seal or cracked housing.
When u say oil is discolored, is it milky white or just not clear like when u put it in?
As far as $600 for repair, If that is pulling lower unit, pressure checking, repairing as needed, installing new water pump, and reinstalling lower unit, its not too bad.
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