As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO GATE DUE TO SEVERE AIRFRAME VIBRATION. INSPECTED BOTH ENGINE INLET AND EXHAUST IAW MM 72-00-00. NO DEFECTS NOTED. PERFORMED POWER ASSURANCE CHECK IAW 71-00-00. ALL INDICATIONS NORMAL. ALSO, OBSERVED NORMAL OPERATION OF ANTI-SURGE AND BLEED VALVE OPERATION IAW MM 72-00-00. AIRCRAFT RETURNED TO SERVICE. (M)