As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT L PRIM HYD OVHTEICAS ILLUM WITH L DEM PUMP INOP RETURNED TO LAND. AIRCRAFT WAS GROUNDED BY MAINTENANCE. MAINTENANCE REMOVED AND REPLACED EDP FILTERS IAW B767 AMM 29-11-05 AND REPLACED EDP IAW 29-11-05. LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.