As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
Y RSRV OVERHEAT -YELLOW RSRV OVERHEAT DURING FLIGHT, THEN PTU OFF WAS COMMANDED, WE LOST YELLOW SYSTEM. CORRECTIVE ACTION: JAN 12. IN ACCORDANCE WITH TSM 29-13-00-810-802-A PARAGRAPH 3.B.(1) THE OPERATIONAL TEST YELLOW HYD SYSTEM WAS PERFORMED SATISFACTORY. HOWEVER IN ACCORDANCE WITH AMM 29-24-21-400-001-A YELLOW E.PUMP CHECK VALVE WAS REPLACED. P/N ZCV63-6-1