As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SINGLE PDC OPERATION MESSAGE. APPROXIMATELY 5 MINUTES LATER RIGHT NAVIGATION DISPLAY LOST NAVIGATION DISPLAY OR NAVIGATION COURSE MAGENTA LINE. FOLLOWED QRH, FMC BOTH ON 1. ALL DATA RESTORED TO NORMAL. ACFT GROUNDED. PERFORMED BOTH FMC BITES IAW FIM TASK 34-61 TASK 801. NO FAULTS FOUND ON EITHER COMPUTER. REBOOTED BOTH FMC COMPUTERS. ACCOMPLISHED BITE. NO FAULTS FOUND IAW FIM 34-61 TASK 807. SOFTWARE FAULTS. FMC OPS NORMAL.