Given the pressure, a patch on the lines is likely not to last very long. It may be possible to remove a section and with the proper tools attach the appropriate fittings to replace just the leaking section. All said and done though it'll probably be easier just to replace the whole section. To bleed the system put the rear wheels securely on blocks or ramps. Block the front tires, set the brakes and start the engine. There is a bleed nipple in the level control at the rear that you can open to drain the system. At idle the fluid will drain out relatively slowly. Be sure not to let the pump run dry; you will need to add clean fluid as the old fluid runs out. You may also want to drain the lines from the accumulators by disconnecting them. The system should self bleed just by running it so check the resevoir level a few times after you drive the car.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold