As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO FIELD & PILOT DECLARED AN EMER DUE TO YELLOW HYD SYS OVERHEAT AFTER DEPARTING. RETURNED FOR PRECAUTIONARY LANDING. SERVICED YELLOW HYD SERVER IAW MM 12-12-29 & REPLACED NR 2 ENG YELLOW HYD SYS PUMP HP FILTER IAW AMM 29-13-45. RAN NR 2 ENG & PERFORMED OPERATIONAL TEST OF YELLOW HYD SYS IAW MM 29-13-00-710-002.