Picked up the my 2012 today from the mechanic. The mechanic is an indy that does a lot of work on Rovers, Mercedes, and Porsche. Had front and rear crossovers done, along with the water pump, thermostat, and the few little coolant pipes that all connect down there. Also had him do the drive and accessory belts, as well as the fan clutch. He said the old crossover pipes looked "okay." As a reminder, the front was done around 40k miles ago, but the rear has never been done (have 105k miles on it). As for the rear, he said it looked like a 100-thousand mile plastic coolant part, but not necessarily like it was in imminent danger of failing. He said he knows the rear are a failure point, but he checked his books and he's only ever done one of them before. He said he's done more fronts than he can count, and does them so often that he keeps a few of them in stock.