As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH AUTO PRESSURIZATION REGULATORS FAILED MULTIPLE TIMES DURING CLIMBOUT. ELECTED TO CONTINUE FLIGHT USING MANUAL PRESSURIZATION. FACT MEM U NO HISTORY. PERFORMED CABIN PRESS CTL TEST. NO FAULTS FOUND. R & R NR 1 PRESS CONTROLLER AS PRECAUTION BECAUSE IT SHOWED -160 FOR CABIN ALT (NR2 SHOWED 180). NEW CONTROLLER SHOWED CORRECT CABIN ALT OF 180. ACFT OK FOR SERVICE. AMM 21-31-00-05 AND 21=31-11-04. FAILED OPS CK. REPLACED WITH SERVICABLE UNIT.