As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON DESCENT THERE WERE TWO LOUD BANGS FROM #1 ENGINE AND A FLASH OF FLAME FROM THE ENGINE EXHAUST DUCT. AFTER FIVE SECONDS THIS EVENT REPEATED ITSELF. AN EMERGENCY WAS DECLARED AND AN UNEVENTFUL LANDING WAS CARRIED OUT. POST FLIGHT INVESTIGATION FOUND THE #1 ENGINE HIGH PRESSURE BLEED VALVE HAD FAILED. THE VALVE WAS REPLACED.