As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE HYDRAULIC GREEN HI TEMP CAME ON CLIMBING THRU 25000 FT. QRH PROC ACCOMPLISHED AND THE GREEN HI TEMP LIGHT WENT OUT ABOUT 3-5 MIN LATER. AIR RETURN TO MSP. MAINTENANCE REPLACED NR 3 ENG HYD PUMP P/N 521449, S/N OFF MX644694, S/N ON F9840810 PER AMM 29-10-17 201. RAN AC HYD SYSTEM DURING 1/2 ENGINE RUN AT RUN PAD, OPS AND LEAK CHECKS GOOD, NO DEFECTS NOTED.