As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD 3 HI TEMP CAUTION MESSAGE, COMPLIED WITH QRH. TEMP AT 190 C (FLIGHT 3904 - FILED CLOSED) TROUBLESHOT FOUND TEMP SENSOR STUCK @ HIGH TEMP. REMOVED AND REPLACED #3 HYDRAULIC TEMP TRANSDUCER IN ACCORDANCE WITH CRJ900 AMM 29-36-03. OPERATIONAL CHECK/ LEAK CHECK GOOD.