As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, LEFT HIGH FLOW PRESSURE RELIEF/SHUTOFF VALVE FAILED TO REGULATE LT ENGINE BLEED AIR RESULTING IN DOWN STREAM OVER PRESSURE CONDITION CAUSING THE OVER PRESSURE RELIEF VALVE TO OPEN PREVENTING WHICH FURTHER DAMAGED TO DOWN STREAM COMPONENTS. FAILING VALVE WAS RETURNED TO MFG ON 17 JAN 2012 FOR EVALUATION. MFG FAILURE ANALYSIS DETERMINED THE PISTON RETURN SPRING FRACTURED.