2G Spun 2 rod bearing at the dyno

[Jacolu3]

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So I took my car to the dyno yesterday and after a few pulls we started to notice a ticking noise. So we decided to pull the car off the dyno and I had the car towed home. I dropped the oil pan today and found cylinder 1&4 have a spun rod bearing. I'm not sure what would have caused this to happen and now I'm not sure how to proceed.
The engine was built about 6000k miles ago with acl bearing with eagle rods and wiesco pistons.
Do I need to do a complete tear down now? Or can I just replace the bearings?

 

[livedsm4g63]

Yeah, i wouldnt suspect the turbo to be bad or need a rebuild then. Never hurts to take a look at the inlet and outlet of the turbo though. I would clean the lines though just to make sure theres nothing in there that could hinder the newer build.