What was found
(CAN) THE FLIGHT DEPARTED WITH AN AIR CONDITIONING PACK ALREADY ON MEL. DURING CRUISE, THE ACFT ENCOUNTERED AN ENGINE BLEED LOSS, RENDERING THE OTHER AIR CONDITIONING PACK ALSO UNSERVICEABLE. IAW STANDARD PROCEDURE FOR THIS SITUATION, THE FLIGHT CREW DECLARED A PAN PAN WITH ATC, TO ESTABLISH PRIORITY AND PERFORMED AN EMERGENCY DESCENT FROM CRUISE ALTITUDE TO 10,000 FT. ONCE STABLE, THE FLIGHT CREW DIVERTED THE ACFT BACK IN CONSULTATION WITH FLIGHT DISPATCH AND MAINTENENCE. THE ACFT DID LAND OVER THE MAXIMUM STRUCTURAL WEIGHT, HOWEVER THE ACTUAL LANDING WAS OTHERWISE ROUTINE. CFR DID MEET THE ACFT AS A PRECAUTION.