Most large parts stores can make up hydraulic, A/C, and other type hoses. They need a sample of the fittings, the dimensions and the pressure requirement on Hydraulic hoses and can make them for you.
I would certainly purge the system and replace with new fluid.
Marvin
2010 Coachman Freelander 22TB on a
2008 Sprinter/Freightliner chassis
1995 Geo Tracker (Toad)