What was found
(CAN) DURING CRUISE AT FLIGHT LEVEL 390 NO ENGINE BLEED FAULT , BLEED SHUT OFF, 10 MINUTES LATER NR 2 ENGINE BLEED FAULT. LOSS OF PRESSURIZATION EMERGENCY DESCENT TO 8000 FT, ABLE TO RESET BLEEDS AND CLIMB BACK TO FLIGHT LEVEL 160 NO FAULT FOUND, FDR SENT FOR READ OUT.