As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA SEATED IN AFT CABIN REPORTS VIBRATION IN FLOOR WHEN WE ARRIVED AT GATE IN SEA AFTER ENGINE SHUTDOWN. CO-INCIDED WITH APU BLEED AIR ON. VIBRATION WENT AWAY WHEN APU BLEED TURNED OFF. GROUNDED - YES. (RESOLVED ON W/O: 1974796 TASKCARD: N/R-00003 ) APU RAN IN ALL CONFIGURATIONS. NO DEFECTS NOTED. OPS CHK GOOD.THIS CLEARS MEL 49-1BPLACARD REMOVEDSEAMC PETER NOTIFIEDS.