I took my car in for its annual service and two late notification recalls today.The service experience itself, time waiting for the work to be completed and cost from my local dealer were fine.Being quite a thorough (OCD) kind of person; I inspected my car pre and post service; (the latter on return home). All appeared well on the surface, but on closer inspection under the bonnet, I noticed immediately that the engine cover had been damaged/cracked.The cover is held in place by four separate plugs that engage into mounts in the engine bay. I know from my own experience that removal requires careful 'one plug at a time removal' and not 'grab and pull'.I returned to the dealership and within less than 5 minutes of being seated, the mechanic and service manager appeared with a new cover. Apologies from the service manager and lots of sincere apologies from the mechanic followed as we went out to my car. The mechanic showed me how he had lifted it from the front, 'grab and pull', which had twisted it and caused it to crack. A lesson learned.Whilst I am pleased that the issue was resolved efficiently and without quibble, I am annoyed that had it gone unnoticed, then I would have had no justifiable claim in the months to come. Customer service for me would have equalled a cracked and replaced cover within the workshop and my never needing to know.I have sympathy for the mechanic, but I could have been £xx out of pocket if I had elected to replace it months down the line. Knowing the Nissan pricing structure, I bet this isn't cheap either.My advice; remove the cover yourself before taking the car in for a service - I will be doing so going forward. This may apply to the diesel and/or NA petrol - I am not familiar with either.