As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: CLIMBING PAST 22,000 LOUD BANG ON 1L DOOR FOLLOWED BY HIGH FREQ VIBRATION AND LOUD BUZZING SOUND DOOR APPEARED TO NOT BE FLUSHED AND APPEAR TO LOOK DIFFERENT THAN THE 2R DOOR; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW. (OPEN).