What was found
DURING CLIMB WHILE PASSING THROUGH 12,000 FEET, RECEIVED CAB PR SYS 1 & 2 FAULT MESSAGE AND OXYGEN MASKS DROPPED IN MAIN CABIN. DECENDED TO 8.000 FEET, DIVERTED TO DTW, AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED A BLANKING PLUG FROM THE NR 1 CABIN PRESSURE CONTROLLER PRESSURE PORT. OPERATIONAL CHECKOK.