As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YELLOW HYD SYSTEM OVERTEMP ANNUNCIATOR ILLUMINATED IN FLT. AIR RETURN TO MSP. MAINTENANCE REPLACED NR 3 EDP P/N 521449, S/N ON F9932438, OFF MX653033 IAW 29-10-17, DID NOT FIX. REPLACED NR 3 ENGINE HYD ISOLATION VALVE P/N HTE9531-3, S/N ON 1190UB1/5, S/N OFF FRTR004AY IAW 29-10-14. OPS AND LEAK CHECK GOOD.