There is a "Wilhelm Scream" for TV police radio chatter. It's a sound effect that you've probably heard hundreds of times without realising it. I first encountered it while playing SimCity 3000 and it has bugged me for 20 years because I couldn't work out what was said.
Here is the soundbite and an extensive list of TV show episodes and movies where it's been spotted:
Please go listen to it for a few times and write down what is being said before you read my analysis
"Beta, scrub for one-forty-eight-nine St Andrews; prowler heard, not seen."
She's saying that the Beta (backup) unit(s) should scrub (cancel) their dispatch order to 1489 St Andrews because the alpha unit no longer needs backup. The complainant has said that a prowler (someone lurking outside) was heard, but not seen. Probably the alpha unit suspects it to be a false alarm on that basis.
This is only my guess, based on listening to it 1 billion times, but it seems to fit the context of the soundbite. Why she refers to backup as "Beta" instead of the NATO phonetic "Bravo" is a bit odd, but maybe that's just her preference, or maybe current NATO phonetic wasn't as common in policing in the 70s
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