Steering pumps fail often on 407. I replaced hydraulic pump (LUK) for my 2007 model from https://elartcom.eu/ Price good considering quality, they had new and reman. Took 11 days, pump arrived filled and sealed. Steering smooth again, no leaks. Catalog detailed for PSA - filter by engine and steering type. Not always rock-bottom, but better than waiting months locally or risking bad reman. Helpful for French cars that are tricky to source.