As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH AUTOMATIC CABIN PRESSURIZATION SYSTEMS FAILED AFTER TAKE-OFF. RETURNED TO DEPARTURE. PERFORMED BITE ON BOTH AUTO PRESSURE CONTROLLERS IAW AMM 21-32. BOTH HAVE AN AC MOTOR FAULT. FOUND INTERMITTENT AUTO PRESSURE INOPERATIVE, 1 AND 2 WHEN NOZZLE VALVE REACHES FULLY CLOSED POSITION. FOUND NOZZLE VALVE CAME TO STOP BEFORE ACTUATOR REACHED THE STOP POSITION. ADJUSTED NOZZLE VALVE PUSH ROD. OPS CHECKED GOOD.