As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FL 380 CABIN PRESSURE DIFFERENTIAL NEEDLE IN ORANGE CAUTION RANGE AT 8.55 PSI NO FAULT LIGHTS ON. ACFT GROUNDED. PERFORMED GROUND VERIFICATION TEST OF NR1 & NR2 DIGITAL CABIN PRESSURE CONTROLLERS BITE CHECK IAW FIM TASK 21-31-00-810-801. OPS CHECKED GOOD NO FAULTS NOTED NO HISTORY PAST 30 DAYS. OK FOR SERVICE.