As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GREEN HYD HI TEMP OCCURRED EN ROUTE QRH WAS FOLLOWED AND HI TEMP LIGHT WENT OUT AFTER 30 SEC. AIR RETURN TO GPT. MAINTENANCE REPLACED GREEN ISOLATION VALVE P/N ON OFF HTE9531-3, S/N ON FR052A, S/N OFF FR046BA IAW AMM 29-10-14 201, OPS AND LEAK CHECK GOOD.