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I would remove the entire system and do all the little things that need attention. I would do a partial engine drop to access all the areas. There's a technical blog on this website that will show you how to preform the engine drop. I would reseal the case vent cover, replace the oil light sender and check all the hoses for dry cracks. You can check the air box for cracks too. Would be a good time to replace the sound pad on the firewall if needed.
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