As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTB DUE TO CABIN AUTO PRESS CONTROLLER INOP. PROBLEM OCCURRED AFTER AC WAS DEICED. PERFORMED BIT ON AUTO1 AND AUTO2 CABIN PRESS CONTROL UNIT BOTH FAULTED. CONTROLLER PERFORMED, VERIFY NO FAULTS. RESET BOTH CONTROLLERS, NO FAULTS, NO MSGS, NO HISTORY ON AUTO PRESS. AC OK FOR SERVICE.