As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: NUMEROUS ANOMALIES NOTED ON FMS DURING DESCENT, INCLUDING TRANSITION ALTITUDE, VERTICAL AND SPEED PROFILES. POST FLIGHT REPORT GIVES MESSAGE "21-31 CAB PR LO DIFF PR". NO ASSOC MX MSG. PER TSM 21-31-00-810-810-A POSSIBLE CAUSE IS ABNORMAL A/C PERFORMANCE DUE TO SUSTAINED RATE OF DESCENT. NO MAINT ACTION NECESSARY.