As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC DISAGREE FLAG DURING TAXI OUT HAD POWER DROP-OFF GND POWER AT GATE 18 SAN DIEGO BUT NO FMC FAULTS OR IMPROPER INDICATIONS UNTIL TAXI. FOUND OUT THIS IS A KNOWN PROBLEM FOR GATE 18. FOLLOWED CHECKLIST PROCEDURE AND FAULT RESOLVED. OPS NORMAL.