As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABORTED TAKEOFF AT DEN. HEARD LOUD AND FREQUENT CHOO CHOOING. FLIGHT ATTENDANT DID NOT REPORT NOISE SO SUSPECT IT WAS NOT ENGINES. CREW FELT VIBRATION. SUSPECT FROM AIR CONDITIONING PACKS. SUPPLEMENTAL DATA UPDATE: CHECKED ENGINE INLETS AND FOUND NORMAL. RAN PACKS AND FOUND ALL TO BE WORKING NORMALLY. REPLACED LEFT 35 DEGREE CONTROLLER AS PRECAUTIONARY.