I'd be keeping a close eye on it and reporting any dodgy behaviour on the engine. As suggested, make sure they've put the error in their system and you get a copy of it.
I would demand that they extend warranty on the engine for any faults that could be attributed to muck getting sucked in and causing a problem after the warranty period expired. There's a level of trust you place in the people that service your vehicle and if their negligence can be attributed to a costly repair, it's certainly unfair to have to foot the bill for it.
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