The PS line from the reservoir to the rack (with the swedged steel coil mounted on the rack) is leaking at the reservoir. I replaced the other one already, now this one is going. Can I just swith the factory clamp to a conventional hose clamp or do I really need to buy a whole new hose assembly...

Try the hose clamp first. All you have to lose is 20 mins and about $2 :)

Good luck,
Bernman

P.S. If it is leaking at the reservoir, it is likely that a good hose clamp will fix the leak. Fingers crossed.