What was found
(CAN) AS THE TLA WAS REDUCED TO INITIATE DESCENT FROM AN ALTITUDE OF APPROXIMATELY 39,000 FT, A POPPING NOISE WAS HEARD, FOLLOWED BY A FLAMEOUT, ENGINE FAIL MESSAGE, WHICH IMMEDIATELY WAS RECOVERED BY THE AUTO-RELIGHT CAPABILITY. ACFT HAS BEEN RETURNED TO SERVICE AFTER BLEED VALVE RIGGING ADJUSTMENT. THIS EVENT WAS ORIGINALLY A CATEGORY 3 AND WAS RAISED TO A CATEGORY 2.