Sounds like UA794 (operated by 738) declared an emergency, shut down an engine & returned to EWR shortly after departure this AM.
Found emergency declared here: KEWR2-Dep-Lib-West-Dec-24-2021-1230Z
but can't find after switch to 120.15.
FR24 track in case timecodes help others find where this audio might live
https://www.flightradar24.com/data/flights/ua794#2a4b7075Thanks to all for any help you can provide!