As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB JUST PRIOR TO LEVEL OFF, # 1 ENG VIBE. VIBE 4.1 CONSULTED QRH, DURING THIS TIME A/C LEVELED AT FL 340 & THRUST REDUCED. VIBE REDUCED TO 3.0 10 MINUTES LATER VIBE AT 2.5. GROUNDED - YES. REMOVED #1 ENGINE ESN 874470. REF ASA SHOP W/O 1944222.