Massachusetts- Don McFadden was channel surfing for the Red Sox game, but the Salem senior nearly fell off his chair when red hot sex popped up on his tube instead. Now red-faced Comcast Cable officials are vowing to get to the bottom of the salacious snafu that sent several minutes of hard core porn to countless homes Saturday afternoon on Comcast’s 24-hour news and entertainment network, CN8. `I went by it and said, `Whoa what was that?,’ ” McFadden said yesterday. “Itwasn’t grainy, it was super quality film and production values.” Communications giant Comcast issued a statement yesterday acknowledging the goof. “We apologize for this unfortunate situation,” the statement said. “Within moments, we were able to rectify the situation and have a team in place investigating the cause and taking all measures to ensure that this never happens again.” But Comcast spokeswoman Jennifer Khoury declined to answer any questions. Comcast’s CN8 broadcasts to 6.2 million viewers daily along the Eastern seaboard, according to the company’s website. Comcast Cable also delivers adult programming to pay-per-view customers, but Don McFadden said he isn’t one of those customers. Salem officials yesterday said they were appalled that porn was being pumped into unsuspecting homes – especially because Comcast has a monopoly on cable service in the area. “That type of mistake is unacceptable,” said City Councilor Kevin Harvey, who vowed to investigate the company’s contract with the city at the next council meeting.