I have never heard much about head gasket failure on the diesels, now it cannot be impossible but I would think very unlikely.
Can you clarify what holes were blocked up - and what breather hole is emitting stuff now? I was not aware of any breather to atmosphere on these that could leak anything...
While daily checks may seem good - how often have you been topping up, mine has never had coolant apart from a day or so after a thermostat change, and has (touch wood) never needed oil top up between changes - so if you have been regularly using both something deeper may be going on..
Good luck
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