As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE, THE CREW RECEIVED A LEFT HAND LOW PRESSURE BLEED VALVE FAILED CLOSED INDICATION AND RETURNED TO CAK. MAINTENANCE INSPECTED AND SWAPPED THE LEFT HAND ENGINE LOW PRESSURE AND HIGH PRESSURE BLEED VALVES FOR TROUBLESHOOTING IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 36-00-00 AND THE LOW PRESSURE BLEED VALVE CHECKED GOOD. HOWEVER, THE HIGH PRESSURE BLEED VALVE REMAINED CLOSED AND WAS DEFERRED, 36-1 CODE C.