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 NR 1 ENGINE HIGH VIBRATION ON CLIMB OUT SAW AS MUCH AS 4.3 ON THE GAUGE. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT LAX. REMOVED AND REPLACED TURBINE CENTER FRAME ACCELEROMETER ON NR 1 ENGINE IAW AMM 77-31-06 OPS CHECKED GOOD.