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This retrofit is not really major surgery on the motor.
"Open heart" surgery will be more likely a replacement heart.
You can see a symptom of this bearing failure by an oil leak at the bell housing area. The IMS has an o-ring that can leak when a bearing is near failure. You need to remove the transmission to find out if the leak is coming from the flywheel seal or the IMS o-ring. This leak will most commonly be the flywheel seal, but it could be the IMS o-ring. I would never just replace the o-ring to stop the leak, but install the retrofit immediately.
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