As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK BOTH FMC'S FAILED WITH VTRK ON CAPTAINS SIDE WENT BOTH ON RT IAW QRH AND GOT A DISAGREE FOLLOWED BY VTK ON CAPTAINS SIDE. ACFT GROUNDED. VERIFIED, AFTER CYCLING C/B LT FMC FAILED TO INITIALIZE, POWER ON LIGHT ON LRU BARELY ON. REPLACED LT FMC REF MM 34-61-02. LOAD FMC OPC BCG01JH5 & OPS 549849-018 ALL INSTALLATION TEST PASSED.