Hello Jim B+
Year, make, model, please.
What where the exact circumstances and how long was it run at what temp.
Who did the diagnosis, gasser mechanic or good diesel mechanic you know and trust?
Will he attempt DIY repair, independent shop or MB dealer?
Does he have service information?
Will you be helping with advice or hands on?
More data needed for a real usable answer.

The base answer to your question is; anything is possible.

Sorry "Jim", not trying to be sarcastic or rude, just relevant questions and answers.

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