As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC 1 FAILED MULTIPLE TIMES ON ARRIVAL. GROUNDED - YES. VERIFIED #1 FMC WAS NOT AT FAULT, NO FAULTS NOTED FOR LEFT OR RIGHT FMC'S IN FAULT HISTORY. FOUND FAULTS FOR LEFT HAND MCDU BLANKING ON LEGS 2 AND 5 ON "IN FLT FAULTS" PAGE. REMOVED AND REPLACED LEFT HAND MCDU REF B737-900 AMM 34-61-01. OPS CHECKED GOOD.