As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FO BARO REF SET KNOB REVERTS TO STANDARD REGARDLESS OF PUSH/PULL UNABLE TO SET BARO ON FO SIDE. DECESION MADE TO RETURN TO DFW, NO EMERGENCY AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED FCU IAW AMM 22-81-12.