As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS NEARING TOP OF CLIMB, ALL VNAV DATA LOST ON CLIMB, CRUISE AND DESCENT PAGES. PERF PAGE WOULD NOT ACCEPT ANY COST INDEX NUMBER. CDU MESSAGE DISPLAYED - VNAV INVALID-PERF. MAINTENANCE ACCOMPLISHED BITE OF FMC IAW FIM 34-61-00-810-801. OUTBOUND FLT CREW WAS ABLE TO LOAD FLT PLAN NORMALLY.