What was found
(CAN) AIRCRAFT HAD PACK NUMBER 1 ON MEL FOR REPEAT OVERHEAT FAULT. CREW NOTICED CABIN ALTITUDE CLIMBING. INITIATED DESCENT TO LOWER ALTITUDE. DECLARED MAYDAY WITH ATC. DURING THE DESCENT CABIN ALTITUDE STABILIZED. CREW CONTINUED DIVERSION. RESOLUTION PFR FAULTS "PRESS REG-V 4001HA2 OR SOL 10HA2. INSPECTED & LK CHECKED SENSE LINES. REPLACED BLEED VALVE. R/R #2 ENG PRV 4001HA2 PER A320 AMM 36-11-52. ENGINE RUN CARRIED OUT, BLEED VALVE TESTED WITH NO FAULTS. RE&RE INSPECTION CARRIED OUT. (TC# 20190812002)