As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING DUAL FMC FAILURE FOR APPROXIMATELY 20 SECONDS. GROUNDED - YES. PERFROMRED B737-800 FIM 34-61TASK 801 FLIGHT MANAGEMENT COMPUTER SYSTEM BITE TEST PROCEDURE. LEFT FMC LOGGED "PGM FAULT ON GROUND LEG (G). THIS IS A SOFTWARE ANOMALY. BOTH LEFT & RIGHT FMC'S RECOVERED AND OP CHECK NORMAL REF B737-800 AMM 34-61-00/501. SYSTEMS OK FOR SERVICE.