What was found
DURING CRUISE, COULD NOT CONTROL CABIN PRESSURE IN EITHER AUTO 1 OR AUTO 2, DIVERTED BOS. RAN BITE CHECK AS PER FIM, NUMBER 2 AC POWER FAULT, RESET, ALL CHECK NORMAL. REPLACED NUMBER 2 CONTROLLER AND ALT SELECT ON MODE CONTROL PANEL, UNRELIABLE TEST. REPLACED MODE SELECT PANEL, RAN BITE CHECK AS PER FIM, ALL OPERATION NORMAL AND RETURNED TO SERVICE.