As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE WITH ELEC PUMPS SET TO AUTO. HYD SYS 1 OVHT MESSAGE ON EICAS APPEARED.... HAS HISTORY. MAINTENANCE: T/S IN REF TO FIM 29-30-00-810-803-A STEPS 1 AND 5. GROUND RAN A/C AT 90%. NO DEFECTS NOTED. CLEANED CANNON PLUG AT THERMAL SWITCH. OPS CHECK GOOD OK FOR SERVICE.