I'll join that queue:D
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You will have to have a little look. Does it run?? It may be a stuck valve or something else. As long as it has not done any other damage is not a big deal. The head will probablly need to come off but is not a huge drama with these. More time consuming.
And sorry to disagree, but if it was an ex SES vehicle it would have been driven fairly hard. Have seen it first hand. They are looked after well but just driven hard and loaded up.
Cheers
CraigE