What was found
ON DESCENT TO KMDT RECEIVED CAD REG 2 FAULT, RESET NO HELP. ON LANDING, ACFT SHOWED 3300 CAB ALT, WENT TO MANUAL, TURNED OFF BLEEDS & PACKS. CABIN OUTFLOW VLVS FWD & AFT STAYED CLOSED. OVERBOARD VENT PARTIALLY OPENED, ACFT STILL PRESSURIZED. SAFETY VLV STARTED TO OPEN, FRONT WINDOWS CRACKED, OPENED TO HELP DEPRESSURIZE. WINDOWS ALLOWED TO OPEN & RAPID DE-PRESSURIZED. MEL 10DEC13 14:50 MDT U RELEASED FOR SERVICE IAW MEL 21-31-02-A. CABIN PRESS CONTROL SYS, IDENTIFY 1 OR 2. 2 INOPERATIVE. 2 REG DEACTIVATED & CB OPEN & COLLARED. ENSURE CAB DIF PRESS IS ZERO PRIOR TO OPENING ANY DOORS. PERFORMED CABIN PRESS CONTROL ADJUSTMENT TEST IAW A310 300 AMM 21-31-00-05, NR 2 CONTROLLER FAILED. R&R NR 1 & NR 2 PRESS CONTROLLERS, TESTED GOOD IAW MM21-31-00-05. R&R IAW MM 21-31-11-04. OK FOR CONTINUED SERVICE.