As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS #1 ENGINE ESN862272 EXPERIENCING AN INCREASE IN FAN VIBRATIONS, CNR ISSUED #PRI: 2 TASK CARD 78472010 ETOPS. GROUNDED - YES. ACCOMPLISHED FAN BLADE LUBE T/C 78472010 #3 SPACER WAS DIFFICULT TO REMOVE AND #1 AND #16 SPACERS HAD DELAMINATED ELASTOMER. REPLACED ALL 3 SPACERS ON T/C 78472010. ACCOMP TEST 7 VIBRATION SURVEY PER B737-900 AMM 71-00-00-350-001 AND FOUND WITHIN LIMITS OF ALASKA AIRLINE POLICY.