What was found
(CAN) CREW RECEIVED A NO. 2 ENGINE DRIVEN HYDRAULIC PUMP CAUTION LIGHT. CREW ACTIONED THEIR QRH, PRESSURE AND QUANTITY REMAINED NORMAL. FLIGHT CONTINUED TO DESTINATION AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED A FAILED NO. 2 ENGINE DRIVEN HYDRAULIC PUMP. DURING ENGINE RUN THE NO. 2 HYDRAULIC PRESSURE FLUCTUATED AND CAUTION LIGHT CAME ON. FURTHER TROUBLESHOOTING DISCOVERED SYSTEM METAL CONTAMINATION. A SECOND NO. 2 EDP PUMP WAS REPLACED AND VARIOUS OTHER COMPONENTS HAVE ALSO BEEN REPLACED Ï¿½ (POWER TRANSFER UNIT, R/H HEAT EXCHANGER BYPASS VALVE) EXTENSIVE TROUBLESHOOTING BEING COMPLETED. ALL AFFECTED SYSTEMS FILTERS OR SCREENS ARE BEING REPLACED OR CLEANED AND A COMPLETE SYSTEM FLUSH TO BE COMPLETED.