The leak might (!) be helped with a power steering stop-leak additive. I'm not talking about PS fluid with stop leak added, I'm talking about the stuff specifically made to stop leaks in the PS system which is more concentrated. Use a turkey baster to suck out as much PS fluid as you need to use the product, then add it in and see if it fixes the leak. My wife's PS system had a small leak years ago and the additive stopped the leak entirely. It works by helping to swell the seal back up so it won't leak any more.