As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS IS A RESUBMISSION OF CONTROL MUMBER 2024FA0000420 UNDER G/A ON 5-31-24 DURING CLIMB AT LEVEL OFF FL290 HEARD A POP UNDER OUR FEET FOLLOWED BY NOTICEABLE VIBRATION. SEEMS TO VIBRATE MAYBE ON THE LEFT SIDE OF THE AIRCRAFT . AC REURNED TO FIELD AND MAINTENANCE GROUNDED AC . MAINTENANCE REMOVED AFT RAM AIR INLET DOOR ASSY AND DEFERRED IAW ABX-CDL-21-53. AND RETURNED AC TO SERVICE .