As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT FROM PHX EN ROUTE FOR BDL THE NR 1 ENGINE DRIVEN (GREEN) HYDRAULIC PUMP FAILED. TURNED BACK TO PHX, TOUCHED DOWN AT 144,000 LBS AT LESS THAN 100 FPM. MAINTENANCE TROUBLESHOT AND FOUND GREEN HYDRAULIC SYSTEM PRESSURE SWITCH (1074GK) DEFECTIVE. REMOVED AND REPLACED PRESSURE SWITCH (1074GK) IAW AMM 29-11-17-04. OPERATIONAL CHECK OF GREEN HYDRAULIC SYSTEM WAS GOOD.