My fridge is making a loud buzzing noise—should I be worried, and who can I call that actually knows what they’re doing?

Alright, so here’s my revenge story. A sketchy tech tried to charge me $400 for a Sub-Zero “diagnostic.” I bounced and found https://sub-zero.nyc/ through a coworker. Called them out of spite, honestly. The guy they sent out showed up on time, didn’t talk circles, and fixed my ice maker with one tiny replacement. Charged what he said he would. No bait-and-switch. Finally feels good to not get fleeced for once.