What was found
FLT 504 EN-ROUTE, WHILE IN CRUISE FLIGHT, THE ACFT EXPERIENCED A GREEN HYD SYS OVERHEAT WARNING, FOLLOWED BY A GREEN HYD ENG 1 PUMP LOW PRESS FAULT, THEN A PTU FAULT. AS A PRECAUTION, THE FLIGHT DIVERTED. THE FLIGHT CREW DECLARED AN EMER. THE FLIGHT LANDED WITHOUT INCIDENT & THE ACFT WAS TOWED TO THE GATE. REPLACED THE NR 1 ENG HYD PUMP & FILTERS ASSOCIATED WITH THE GREEN HYD SYS.