I had them pull the oil-cooler. When they got it to the shop and were taking it apart three bolts broke off but they managed to pull the core out. The core consists of tubes that the raw water runs through and the oil circulates on the outside of the tubes. The core was in very bad shape, about half the tubes were completely blocked with crud and there was more of the kidney-stone type junk. They are going to run a solvent through it for a good while with a pump, it'll circulate and dissolve all the junk.
They will then have to drill out the broken bolts and re-thread the holes. Chris said they have the equipment on-site to do all of this. Not sure how long it will take but I'd guess at least the rest of the day.
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