HELP! Im still losing power steering liquid..and now its faster than before.

2 months ago, I had my rack and pinion / power steering overhauled since I was losing a bit of fluid..a few days after, there was still a leak. Sent the car back to the shop and they replaced and doubled up the o rings and the problem was gone...well, until yesterday.

I brought the car back to the shop since its still under warranty. The brought down the assembly and discovered that the shafting has some small parallel groves which you can only see by running your fingers throught it and also taking note of the shine of the metal.

The shop owner recommends HARD CHROMING the shaft and then replacing the o rings again. What do you guys think of this? Have you tried this and will this last?

I have been unsuccessful looking for surplus assemblies for this. Any shops you can recommend? How much would it cost? Car is a coroll 93-93 model, big body GLi.