As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RESUBMITTING SDR, NOW WITH UNIQUE CONTROL NUMBER. ON AIRCRAFT POWER UP, PRESSURIZATION AMBER AUTO FAIL AND GREEN ALT LIGHTS ILLUMINATED ON COCKPIT OVERHEAD. DURING SUBSEQUENT TROUBLESHOOTING NR 2 CABIN PRESSURE CONTROLLER P/N 7121-19971-01AC FAILED LRU BITE CHECK. CABIN PRESSURE CONTROLLER WAS REPLACED AND SYSTEM OPERATIONALLY CHECKED NORMAL.