As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT DEPARTED NORMALLY UNDER MEL FOR BLEED 1 INOP. AFTER DEPARTURE THE FLIGHT EXPERIENCED A FAILURE OF THE OTHER BLEED. THE CREW CALLED A PAN PAN AND DID A RAPID DESCENT TO 10,000 FT AND RETURNED WHERE THEY ARE EXPECTED TO LAND OVERWEIGHT . REPLACED LT BLEED PRESSURE SENSOR IAW AMM 36-14-12 AND SPDA 2 AMS CONTROLLER I/O MODULE AS INDICATED IN DEFERAL. CHECKED TORQUE MOTOR FILTERS AND LEAK CHECKED LINES WITH BUBBLE FLUID - NO FAULTS FOUND.