If you care for a genuine report, rather than all of our speculation (much of it wise, but maybe not as exact as you need), contact
Frank D'Angelo. His business is home warranty inspections and he certainly knows what to expect, and the construction practices of the various builders. I'm sure he will be able to diagnose the problem.
As an aside... my quandary is the opposite of yours. We've always had gas ranges, but our village, Chitty Chatty has no gas service for any of the homes. So, we have electric and I'm still getting used to scorching things. Our frequent "emissions" are from burnt offerings. Best luck with finding your answer.