Producers of “Grease Live” are scrambling to fix a sound snafu that crept up during Julianne Hough’s performance of “Hopelessly Devoted to You” during the live telecast.

What sounded like microphone static was audible during the live airing in the East Coast time zone while Hough belted out one of the show’s signature numbers. Fox said producers and the show’s tech team on site were working to clean up the soundtrack for the West Coast airing that begins at 7 p.m. PT.

The “Hopelessly Devoted” number came at about two-thirds of the way into the telecast around 9 p.m. ET.

“Grease Live” is originating from the Warner Bros. lot in Burbank. Producers have already had to grapple with rain that complicated the show’s opening number. But cast members rolled with the change by improvising with umbrellas — in red and white Rydell High colors, of course.

Other than the brief sound issue, the ambitious three-hour production unfolded with no major problems that could be seen on screen. The telecast closed with a tribute slate to Greg Hudgens, father of co-star Vanessa Hudgens, who died Saturday. The actress earned an outpouring of sympathy and respect via social media for continuing with her performance in the key role of Rizzo despite her loss.