As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING FAN BLADE LUBE ON NR 1 ENGINE T/C 78472010, FOUND MOLYDAGE COATING MISSING UP TO 100% WITH NO WEAR TO SHIM BASE MATERIAL. GROUNDED-YES. PER B737-900 AMM 72-21-02-200-801-F00 2L(1)(B) 3): ALL SHIMS ON NR 1 ENGINE MUST BE REPLACED WITHIN 1850 CYCLES.