Ok, but nonetheless he has deemed it as repaired and therefore satisfactory, so better not to alter it otherwise it will become your responsibility for any future problems.
In a sense, they could possibly argue under the terms of your Homecare agreement, that even if it was installed incorrectly 30 years ago, it is still not covered by their repair service. By the same token, now that the engineer has re-fitted a pipe that was of the incorrect size, (s)he has taken on liability for any problems resulting from a faulty re-installation, for the next 30 years!
In a sense, they could possibly argue under the terms of your Homecare agreement, that even if it was installed incorrectly 30 years ago, it is still not covered by their repair service. By the same token, now that the engineer has re-fitted a pipe that was of the incorrect size, (s)he has taken on liability for any problems resulting from a faulty re-installation, for the next 30 years!
