As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 4 HYD OVERHEAT, TEMP WOULD RISE TO 96 DGR WITH ADP RUNNING, TEMP WOULD RISE TO 88 DEGREES WITH AUX PUMP RUNNING. DPI INDICATORS ARE IN ON CASE DRAIN MODULE AND RETURN FILTER MODULE. MEASURED TEMPERATURE AT RETURNED MODULE MATCHES FLIGHT DECK INDICATION AND HYD QTY IS NORMAL. REPLACED NR 4 ENG HYD TEMP SENSOR, RETURN FILTER, AND CASE DRAIN FILTERS.