What was found
SHORTLY AFTER TAKE OFF, ECAM INDICATED GREEN HYD SYS OVERHEAT, ALONG WITH ASSOCIATED ECAMS FOR GREEN SYS FAILURE. OVERHEAT LIGHT STAYED ON THROUGH CLIMB TO ALTITUDE. AFTER 10 MINUTES AT ALTITUDE, DECLARED EMERGENCY AND DIVERTED. LIGHT EXTINGUISHED DURING APPROACH, AND REMAINED OFF. APPROACH AND LANDING WERE UNEVENTFUL. R & R THE HYD SYSTEM OVERHEAT DETECTOR IAW AMM 29-33-12-04-0, TESTED SYSTEM IAW AMM 29-33-00 P. BLOCK 501. OPERATED BOTH ENGINES IAW JRH. SYSTEM TESTED NORMAL, NO FAULTS FOUND. ACFT OK FOR SERVICE.