I suspect they won’t want to search to deeply as they’ll find that if they have to dump bad votes, the Pubbie will get MORE votes.
I suspect a Democratic fraud vote scheme that miscalculated leaving the Pubbie still in the lead. The Dems can tap into the narrative going around about how late vote arrivals are benefitting the Dems and use it to say that the same has happened to their candidate and there-by force a rerun of the election in that district.
And it could intentionally go bad and The January 2019 Nancy Boys & Girls could refuse to seat the Republican.
“In November 2018, Nancy Pelosi announced her intention to restore the Elections Subcommittee of the Committee on House Administration in the 116th Congress and name Congresswoman Marcia L. Fudge the Chair.”
https://en.wikipedia.org/wiki/United_States_House_Committee_on_Elections