What was found
(CAN) AIRCRAFT DEPARTED WITH MEL 36-11-01, ENGINE 2 BLEED INOPERATIVE. ENROUTE, THE SECOND BLEED STARTED FLUCTUATING. THEY ELECTED TO CARRY ON TO PLANNED ARRIVAL BUT LOST THE SECOND BLEED NEAR DESCENT POINT, AND DECLARED A PAN EMERGENCY DUE UNABLE TO MAINTAIN CABIN PRESSURE. ASR WILL BE FILED. HP VALVE REPLACED IAW MM 36-11-51, PB 401. TESTED AND LEAK CHECKED OK.