As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB LEFT ENGINE N1 READ AS MUCH AS 6% HIGHER THAN THE RIGHT ENGINE. NO ASSYMETRIC THRUST NOTED BY YOKE POSITION EGT FUEL HOW N2 AND N3 WERE A LITTLE HIGHER BUT NOT AS MUCH AS THE N1. NO LIMITS EXCEEDED. NO EICAS OF STATUS MESSAGE, PERFORMED ENGINE PER MM 71 00 00 CONFIRMED A 4% DIFFERENCE IN N1 AT ALL SPEEDS ABOVE IDLE REQUIRES FURTHER T/S LF 1199911 10/12/19 UPON FURTHER REIVE FOUND TO BE WITHIN LIMITS REF MM 76 11 00