As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING RT ENGINE PRIOR TO TAKEOFF THE CABIN ALT DESCENDED RAPIDLY APPROX 1000 FPM. AUTO INOP LIGHT ILLUM SHORTLY THEREAFTER. T/S PER FIM. BIT CHECKED CABIN AUTO CONTROLLERS. CABIN AUTO 1 FAULTED SELECTOR PANEL AND AUTO 2 FAULTED ITSELF. PER FIM REPLACED NR 2 CABIN AUTO CONTROLLER AND CABIN ALT CONT PANEL PER MM. CABIN AUTO CONTROLLER 1 AND 2 BITE CHECK OK. NO FAULT. EICAS MSG CLEARED.