Well, it could be any pipe that carries high pressure. There's a number in that area and the only way to identify its role in life is to trace it from both ends and see where it goes...
Generally it will be a bit porcine (or even Suidae) to repair it as access will not be wonderful. All those pipes went in before the engine did
Best bet is to trace it, work out the length and the end fittings and then get Pleiades to make you a new one. You nmay be able to find an easier route for a replacement too. Generally a replacement does not have to follow strictly the old route...
Just hope it's not the high pressure feed to the steering pinion valve as that pipe and it's special rubber section is now NFP. Your only hope if it is this pipe (and I don't think it is given the location) is to get a copy made up by a hydraulic pipe manufacturer like Pirtek.