Here's my 1st reply:
Thanks for letting me know. I'll mail a check out as soon as possible. On very rare occasions will we find that an irrigation line was not properly buried to the industry standard of 10-12".
Please contact the builder to access the entire systems depth before any future aeration service. Generally the shallow pipe is an added line where it wasn't trenched but rather hand dug. Deeper aeration plugs are perfectly fine so as long as all the lines were installed correctly.
I apologize for the inconvenience.